cycle98 Fri Feb 2 17:46:59 2001 EDT
Modified files:
/phpdoc/kr/functions math.xml
Log:
translation english to korean by SeungHwan Lee 001
Index: phpdoc/kr/functions/math.xml
diff -u phpdoc/kr/functions/math.xml:1.2 phpdoc/kr/functions/math.xml:1.3
--- phpdoc/kr/functions/math.xml:1.2 Fri Jan 12 06:16:40 2001
+++ phpdoc/kr/functions/math.xml Fri Feb 2 17:46:59 2001
@@ -1,1155 +1,1191 @@
- <reference id="ref.math">
- <title>Mathematical Functions</title>
- <titleabbrev>Math.</titleabbrev>
-
- <partintro>
- <sect1 id="math.intro">
- <title>Introduction</title>
- <para>
- These math functions will only handle values within the range of
- the long and double types on your computer. If you need to
- handle bigger numbers, take a look at the <link
- linkend="ref.bc">arbitrary precision math functions</link>.
- </para>
- <sect2 id="math.constants">
- <title>Math constants</title>
- <para>
- The following values are defined as constants in PHP by the math
- extension:
- <table>
- <title>Math constants</title>
- <tgroup cols="3">
- <thead>
- <row>
- <entry>Constant</entry>
- <entry>Value</entry>
- <entry>Description</entry>
- </row>
- </thead>
- <tbody>
- <row>
- <entry>M_PI</entry>
- <entry>3.14159265358979323846</entry>
- <entry>Pi</entry>
- </row>
- <row>
- <entry>M_E</entry>
- <entry>2.7182818284590452354</entry>
- <entry>e</entry>
- </row>
- <row>
- <entry>M_LOG2E</entry>
- <entry>1.4426950408889634074</entry>
- <entry>log_2 e</entry>
- </row>
- <row>
- <entry>M_LOG10E</entry>
- <entry>0.43429448190325182765</entry>
- <entry>log_10 e</entry>
- </row>
- <row>
- <entry>M_LN2</entry>
- <entry>0.69314718055994530942</entry>
- <entry>log_e 2</entry>
- </row>
- <row>
- <entry>M_LN10</entry>
- <entry>2.30258509299404568402</entry>
- <entry>log_e 10</entry>
- </row>
- <row>
- <entry>M_PI_2</entry>
- <entry>1.57079632679489661923</entry>
- <entry>pi/2</entry>
- </row>
- <row>
- <entry>M_PI_4</entry>
- <entry>0.78539816339744830962</entry>
- <entry>pi/4</entry>
- </row>
- <row>
- <entry>M_1_PI</entry>
- <entry>0.31830988618379067154</entry>
- <entry>1/pi</entry>
- </row>
- <row>
- <entry>M_2_PI</entry>
- <entry>0.63661977236758134308</entry>
- <entry>2/pi</entry>
- </row>
- <row>
- <entry>M_SQRTPI</entry>
- <entry>1.77245385090551602729</entry>
- <entry>sqrt(pi) [4.0.2]</entry>
- </row>
- <row>
- <entry>M_2_SQRTPI</entry>
- <entry>1.12837916709551257390</entry>
- <entry>2/sqrt(pi)</entry>
- </row>
- <row>
- <entry>M_SQRT2</entry>
- <entry>1.41421356237309504880</entry>
- <entry>sqrt(2)</entry>
- </row>
- <row>
- <entry>M_SQRT3</entry>
- <entry>1.73205080756887729352</entry>
- <entry>sqrt(3) [4.0.2]</entry>
- </row>
- <row>
- <entry>M_SQRT1_2</entry>
- <entry>0.70710678118654752440</entry>
- <entry>1/sqrt(2)</entry>
- </row>
- <row>
- <entry>M_LNPI</entry>
- <entry>1.14472988584940017414</entry>
- <entry>log_e(pi) [4.0.2]</entry>
- </row>
- <row>
- <entry>M_EULER</entry>
- <entry>0.57721566490153286061</entry>
- <entry>Euler constant [4.0.2]</entry>
- </row>
- </tbody>
- </tgroup>
- </table>
- Only M_PI is available in PHP versions up to and including PHP4RC1.
- All other constants are available starting with PHP 4.0. Constants
- labelled [4.0.2] were added in PHP 4.0.2.
- </para>
- </sect2>
- </sect1>
- </partintro>
-
- <refentry id="function.abs">
- <refnamediv>
- <refname>abs</refname>
- <refpurpose>Absolute value</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>mixed <function>abs</function></funcdef>
- <paramdef>mixed <parameter>number</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the absolute value of number. If the argument number is
- float, return type is also float, otherwise it is int.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.acos">
- <refnamediv>
- <refname>acos</refname>
- <refpurpose>Arc cosine</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>float <function>acos</function></funcdef>
- <paramdef>float <parameter>arg</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the arc cosine of arg in radians.
- </para>
- <para>
- See also <function>asin</function> and <function>atan</function>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.asin">
- <refnamediv>
- <refname>asin</refname>
- <refpurpose>Arc sine</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>float <function>asin</function></funcdef>
- <paramdef>float <parameter>arg</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the arc sine of arg in radians.
- </para>
- <para>
- See also <function>acos</function> and <function>atan</function>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.atan">
- <refnamediv>
- <refname>atan</refname>
- <refpurpose>Arc tangent</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>float <function>atan</function></funcdef>
- <paramdef>float <parameter>arg</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the arc tangent of arg in radians.
- </para>
- <para>
- See also <function>asin</function> and <function>acos</function>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.atan2">
- <refnamediv>
- <refname>atan2</refname>
- <refpurpose>arc tangent of two variables</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>float <function>atan2</function></funcdef>
- <paramdef>float <parameter>y</parameter></paramdef>
- <paramdef>float <parameter>x</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <simpara>
- This function calculates the arc tangent of the two variables
- <parameter>x</parameter> and <parameter>y</parameter>. It is
- similar to calculating the arc tangent of
- <parameter>y</parameter> / <parameter>x</parameter>, except that
- the signs of both arguments are used to determine the quadrant of
- the result.
- </simpara>
- <simpara>
- The function returns the result in radians, which is between -PI
- and PI (inclusive).
- </simpara>
- <para>
- See also <function>acos</function> and <function>atan</function>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.base-convert">
- <refnamediv>
- <refname>base_convert</refname>
- <refpurpose>Convert a number between arbitrary bases</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>string <function>base_convert</function></funcdef>
- <paramdef>string <parameter>number</parameter></paramdef>
- <paramdef>int <parameter>frombase</parameter></paramdef>
- <paramdef>int <parameter>tobase</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns a string containing <parameter>number</parameter>
- represented in base <parameter>tobase</parameter>. The base in
- which <parameter>number</parameter> is given is specified in
- <parameter>frombase</parameter>. Both
- <parameter>frombase</parameter> and <parameter>tobase</parameter>
- have to be between 2 and 36, inclusive. Digits in numbers with a
- base higher than 10 will be represented with the letters a-z,
- with a meaning 10, b meaning 11 and z meaning 35.
- <example>
- <title><function>Base_convert</function></title>
- <programlisting role="php">
-$binary = base_convert ($hexadecimal, 16, 2);
-</programlisting>
- </example>
- </para>
- </refsect1>
- </refentry>
-
-
- <refentry id="function.bindec">
- <refnamediv>
- <refname>bindec</refname>
- <refpurpose>Binary to decimal</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>int <function>bindec</function></funcdef>
- <paramdef>string <parameter>binary_string</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the decimal equivalent of the binary number represented by
- the binary_string argument.
- </para>
- <para>
- Octdec converts a binary number to a decimal number. The largest
- number that can be converted is 31 bits of 1's or 2147483647 in
- decimal.
- </para>
- <para>
- See also the <function>decbin</function>
- function.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.ceil">
- <refnamediv>
- <refname>ceil</refname>
- <refpurpose>Round fractions up</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>int <function>ceil</function></funcdef>
- <paramdef>float <parameter>number</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the next highest integer value from
- <parameter>number</parameter>. Using <function>ceil</function>
- on integers is absolutely a waste of time.
- <informalexample>
- <programlisting role="php">
-$x = ceil(4.25);
-// which would make $x=5
- </programlisting>
- </informalexample>
- </para>
- <simpara>
- NOTE: PHP/FI 2's <function>ceil</function> returned a
- float. Use: <literal>$new = (double)ceil($number);</literal> to
- get the old behaviour.
- </simpara>
- <simpara>
- See also <function>floor</function> and
- <function>round</function>.
- </simpara>
- </refsect1>
- </refentry>
-
- <refentry id="function.cos">
- <refnamediv>
- <refname>cos</refname>
- <refpurpose>Cosine</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>float <function>cos</function></funcdef>
- <paramdef>float <parameter>arg</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the cosine of arg in radians.
- </para>
- <para>
- See also <function>sin</function> and <function>tan</function>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.decbin">
- <refnamediv>
- <refname>decbin</refname>
- <refpurpose>Decimal to binary</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>string <function>decbin</function></funcdef>
- <paramdef>int <parameter>number</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns a string containing a binary representation of the given
- number argument. The largest number that can be converted is
- 2147483647 in decimal resulting to a string of 31 1's.
- </para>
- <para>
- See also the <function>bindec</function> function.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.dechex">
- <refnamediv>
- <refname>dechex</refname>
- <refpurpose>Decimal to hexadecimal</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>string <function>dechex</function></funcdef>
- <paramdef>int <parameter>number</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns a string containing a hexadecimal representation of the
- given number argument. The largest number that can
- be converted is 2147483647 in decimal resulting to "7fffffff".
- </para>
- <para>
- See also the <function>hexdec</function> function.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.decoct">
- <refnamediv>
- <refname>decoct</refname>
- <refpurpose>Decimal to octal</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>string <function>decoct</function></funcdef>
- <paramdef>int <parameter>number</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns a string containing an octal representation of the given
- number argument. The largest number that can be converted is
- 2147483647 in decimal resulting to "17777777777".
- </para>
- <para>
- See also <function>octdec</function>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.deg2rad">
- <refnamediv>
- <refname>deg2rad</refname>
- <refpurpose>
- Converts the number in degrees to the radian equivalent
- </refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>double <function>deg2rad</function></funcdef>
- <paramdef>double <parameter>number</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- This function converts <parameter>number</parameter> from degrees
- to the radian equivalent.
- </para>
- <para>
- See also <function>rad2deg</function>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.exp">
- <refnamediv>
- <refname>exp</refname>
- <refpurpose>e to the power of ...</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>float <function>exp</function></funcdef>
- <paramdef>float <parameter>arg</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns e raised to the power of <parameter>arg</parameter>.
- </para>
- <para>
- See also <function>pow</function>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.floor">
- <refnamediv>
- <refname>floor</refname>
- <refpurpose>Round fractions down</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>int <function>floor</function></funcdef>
- <paramdef>float <parameter>number</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <simpara>
- Returns the next lowest integer value from
- <parameter>number</parameter>. Using <function>floor</function>
- on integers is absolutely a waste of time.
- </simpara>
- <simpara>
- NOTE: PHP/FI 2's <function>floor</function> returned a
- float. Use: <literal>$new = (double)floor($number);</literal> to
- get the old behaviour.
- </simpara>
- <simpara>
- See also <function>ceil</function> and
- <function>round</function>.
- </simpara>
- </refsect1>
- </refentry>
-
- <refentry id="function.getrandmax">
- <refnamediv>
- <refname>getrandmax</refname>
- <refpurpose>Show largest possible random value</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>int <function>getrandmax</function></funcdef>
- <paramdef>void </paramdef>
- </funcprototype>
- </funcsynopsis>
- <simpara>
- Returns the maximum value that can be returned by a call to
- <function>rand</function>.
- </simpara>
- <simpara>
- See also <function>rand</function>, <function>srand</function>,
- <function>mt_rand</function>, <function>mt_srand</function>, and
- <function>mt_getrandmax</function>.
- </simpara>
- </refsect1>
- </refentry>
-
- <refentry id="function.hexdec">
- <refnamediv>
- <refname>hexdec</refname>
- <refpurpose>Hexadecimal to decimal</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>int <function>hexdec</function></funcdef>
- <paramdef>string <parameter>hex_string</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the decimal equivalent of the hexadecimal number
- represented by the hex_string argument. HexDec converts a
- hexadecimal string to a decimal number. The largest number that
- can be converted is 7fffffff or 2147483647 in decimal.
- </para>
- <para>
- See also the <function>dechex</function> function.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.lcg-value">
- <refnamediv>
- <refname>lcg_value</refname>
- <refpurpose>Combined linear congruential generator</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>double <function>lcg_value</function></funcdef>
- <void/>
- </funcprototype>
- </funcsynopsis>
- <para>
- <function>lcg_value</function> returns a pseudo random number in
- the range of (0, 1). The function combines two CGs with periods
- of 2^31 - 85 and 2^31 - 249. The period of this function is equal
- to the product of both primes.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.log">
- <refnamediv>
- <refname>log</refname>
- <refpurpose>Natural logarithm</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>float <function>log</function></funcdef>
- <paramdef>float <parameter>arg</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the natural logarithm of arg.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.log10">
- <refnamediv>
- <refname>log10</refname>
- <refpurpose>Base-10 logarithm</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>float <function>log10</function></funcdef>
- <paramdef>float <parameter>arg</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the base-10 logarithm of <parameter>arg</parameter>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.max">
- <refnamediv>
- <refname>max</refname>
- <refpurpose>Find highest value</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>mixed <function>max</function></funcdef>
- <paramdef>mixed <parameter>arg1</parameter></paramdef>
- <paramdef>mixed <parameter>arg2</parameter></paramdef>
- <paramdef>mixed <parameter>argn</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- <function>max</function> returns the numerically highest of the
- parameter values.
- </para>
- <para>
- If the first parameter is an array, <function>max</function>
- returns the highest value in that array. If the first parameter
- is an integer, string or double, you need at least two parameters
- and <function>max</function> returns the biggest of these values.
- You can compare an unlimited number of values.
- </para>
- <para>
- If one or more of the values is a double, all the values will be
- treated as doubles, and a double is returned. If none of the
- values is a double, all of them will be treated as integers, and
- an integer is returned.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.min">
- <refnamediv>
- <refname>min</refname>
- <refpurpose>Find lowest value</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>mixed <function>min</function></funcdef>
- <paramdef>mixed <parameter>arg1</parameter></paramdef>
- <paramdef>mixed <parameter>arg2</parameter></paramdef>
- <paramdef>mixed <parameter>argn</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- <function>Min</function> returns the numerically lowest of the
- parameter values.
- </para>
- <para>
- If the first parameter is an array, <function>min</function>
- returns the lowest value in that array. If the first parameter
- is an integer, string or double, you need at least two parameters
- and <function>min</function> returns the lowest of these values.
- You can compare an unlimited number of values.
- </para>
- <para>
- If one or more of the values is a double, all the values will be
- treated as doubles, and a double is returned. If none of the
- values is a double, all of them will be treated as integers, and
- an integer is returned.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.mt-rand">
- <refnamediv>
- <refname>mt_rand</refname>
- <refpurpose>Generate a better random value</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>int <function>mt_rand</function></funcdef>
- <paramdef>int
- <parameter><optional>min</optional></parameter>
- </paramdef>
- <paramdef>int
- <parameter><optional>max</optional></parameter>
- </paramdef>
- </funcprototype>
- </funcsynopsis>
- <simpara>
- Many random number generators of older libcs have dubious or
- unknown characteristics and are slow. By default, PHP uses the
- libc random number generator with the <function>rand</function>
- function. <function>mt_rand</function> function is a drop-in
- replacement for this. It uses a random number generator with
- known characteristics, the Mersenne Twister, which will produce
- random numbers that should be suitable for seeding some kinds
- of cryptography (see the home pages for details) and is four
- times faster than what the average libc provides. The Homepage
- of the Mersenne Twister can be found at
- <ulink url="&url.mersenne;">&url.mersenne;</ulink>, and an
- optimized version of the MT source is available from
- <ulink url="&url.mersenne.twister;">&url.mersenne.twister;
- </ulink>.
- </simpara>
- <simpara>
- If called without the optional <parameter>min</parameter>,
- <parameter>max</parameter> arguments <function>mt_rand</function>
- returns a pseudo-random value between 0 and
- <constant>RAND_MAX</constant>. If you want a random number
- between 5 and 15 (inclusive), for example, use <literal>mt_rand
- (5, 15)</literal>.
- </simpara>
- <simpara>
- Remember to seed the random number generator before use with
- <function>mt_srand</function>.
- </simpara>
- <note>
- <para>
- In versions before 3.0.7 the meaning of
- <parameter>max</parameter> was <parameter>range</parameter>. To
- get the same results in these versions the short example should
- be <literal>mt_rand (5, 11)</literal> to get a random number
- between 5 and 15.
- </para>
- </note>
- <simpara>
- See also <function>mt_srand</function>,
- <function>mt_getrandmax</function>, <function>srand</function>,
- <function>rand</function> and <function>getrandmax</function>.
- </simpara>
- </refsect1>
- </refentry>
-
- <refentry id="function.mt-srand">
- <refnamediv>
- <refname>mt_srand</refname>
- <refpurpose>Seed the better random number generator</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>void <function>mt_srand</function></funcdef>
- <paramdef>int <parameter>seed</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Seeds the random number generator with
- <parameter>seed</parameter>.
- <informalexample>
- <programlisting role="php">
-// seed with microseconds since last "whole" second
-mt_srand ((double) microtime() * 1000000);
-$randval = mt_rand();
- </programlisting>
- </informalexample>
- </para>
- <simpara>
- See also <function>mt_rand</function>,
- <function>mt_getrandmax</function>, <function>srand</function>,
- <function>rand</function>, and
- <function>getrandmax</function>.
- </simpara>
- </refsect1>
- </refentry>
-
- <refentry id="function.mt-getrandmax">
- <refnamediv>
- <refname>mt_getrandmax</refname>
- <refpurpose>Show largest possible random value</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>int <function>mt_getrandmax</function></funcdef>
- <paramdef>void </paramdef>
- </funcprototype>
- </funcsynopsis>
- <simpara>
- Returns the maximum value that can be returned by a call to
- <function>mt_rand</function>.
- </simpara>
- <simpara>
- See also <function>mt_rand</function>,
- <function>mt_srand</function> <function>rand</function>,
- <function>srand</function>, and
- <function>getrandmax</function>.
- </simpara>
- </refsect1>
- </refentry>
-
- <refentry id="function.number-format">
- <refnamediv>
- <refname>number_format</refname>
- <refpurpose>Format a number with grouped thousands</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>string <function>number_format</function></funcdef>
- <paramdef>float <parameter>number</parameter></paramdef>
- <paramdef>int <parameter>decimals</parameter></paramdef>
- <paramdef>string <parameter>dec_point</parameter></paramdef>
- <paramdef>string <parameter>thousands_sep</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- <function>Number_format</function> returns a formatted version of
- <parameter>number</parameter>. This function accepts either one,
- two or four parameters (not three):
- </para>
- <para>If only one parameter is given,
- <parameter>Number</parameter> will be formatted without decimals,
- but with a comma (",") between every group of thousands.
- </para>
- <para>
- If two parameters are given, <parameter>number</parameter> will
- be formatted with <parameter>decimals</parameter> decimals with a
- dot (".") in front, and a comma (",") between every group of
- thousands.
- </para>
- <para>
- If all four parameters are given, <parameter>number</parameter>
- will be formatted with <parameter>decimals</parameter> decimals,
- <parameter>dec_point</parameter> instead of a dot (".") before
- the decimals and <parameter>thousands_sep</parameter> instead of
- a comma (",") between every group of thousands.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.octdec">
- <refnamediv>
- <refname>octdec</refname>
- <refpurpose>Octal to decimal</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>int <function>octdec</function></funcdef>
- <paramdef>string <parameter>octal_string</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the decimal equivalent of the octal number
- represented by the octal_string argument.
- OctDec converts an octal string to a decimal number. The largest
- number that can be converted is 17777777777 or 2147483647 in
- decimal.
- </para>
- <para>
- See also <function>decoct</function>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.pi">
- <refnamediv>
- <refname>pi</refname>
- <refpurpose>Get value of pi</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>double <function>pi</function></funcdef>
- <paramdef>void </paramdef>
- </funcprototype>
- </funcsynopsis>
- <simpara>
- Returns an approximation of pi.
- </simpara>
- </refsect1>
- </refentry>
-
- <refentry id="function.pow">
- <refnamediv>
- <refname>pow</refname>
- <refpurpose>Exponential expression</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>float <function>pow</function></funcdef>
- <paramdef>float <parameter>base</parameter></paramdef>
- <paramdef>float <parameter>exp</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns base raised to the power of exp.
- </para>
- <para>
- See also <function>exp</function>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.rad2deg">
- <refnamediv>
- <refname>rad2deg</refname>
- <refpurpose>
- Converts the radian number to the equivalent number in degrees
- </refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>double <function>rad2deg</function></funcdef>
- <paramdef>double <parameter>number</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- This function converts <parameter>number</parameter> from radian
- to degrees.
- </para>
- <para>
- See also <function>deg2rad</function>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.rand">
- <refnamediv>
- <refname>rand</refname>
- <refpurpose>Generate a random value</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>int <function>rand</function></funcdef>
- <paramdef>
- <parameter><optional>int min</optional></parameter>
- </paramdef>
- <paramdef>
- <parameter><optional>int max</optional></parameter>
- </paramdef>
- </funcprototype>
- </funcsynopsis>
- <simpara>
- If called without the optional <parameter>min</parameter>,
- <parameter>max</parameter> arguments <function>rand</function>
- returns a pseudo-random value between 0 and
- <constant>RAND_MAX</constant>. If you want a random number
- between 5 and 15 (inclusive), for example, use <literal>rand (5,
- 15)</literal>.
- </simpara>
- <simpara>
- Remember to seed the random number generator before use with
- <function>srand</function>.
- </simpara>
- <note>
- <para>
- In versions before 3.0.7 the meaning of
- <parameter>max</parameter> was <parameter>range</parameter>. To
- get the same results in these versions the short example should
- be <literal>rand (5, 11)</literal> to get a random number
- between 5 and 15.
- </para>
- </note>
- <simpara>
- See also <function>srand</function>,
- <function>getrandmax</function>, <function>mt_rand</function>,
- <function>mt_srand</function>, and
- <function>mt_getrandmax</function>.
- </simpara>
- </refsect1>
- </refentry>
-
- <refentry id="function.round">
- <refnamediv>
- <refname>round</refname>
- <refpurpose>Rounds a float</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>double <function>round</function></funcdef>
- <paramdef>double <parameter>val</parameter></paramdef>
- <paramdef>int
- <parameter><optional>precision</optional></parameter>
- </paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the rounded value of <parameter>val</parameter> to
- specified <parameter>precision</parameter>
- (number of digits after the decimal point).
- <informalexample>
- <programlisting role="php">
-$foo = round (3.4); // $foo == 3.0
-$foo = round (3.5); // $foo == 4.0
-$foo = round (3.6); // $foo == 4.0
-
-$foo = round (1.95583, 2); // $foo == 1.96
- </programlisting>
- </informalexample>
- </para>
- <note>
- <simpara>
- The <parameter>precision</parameter> parameter is only
- available in PHP 4.
- </simpara>
- </note>
- <simpara>
- See also <function>ceil</function> and
- <function>floor</function>.
- </simpara>
- </refsect1>
- </refentry>
-
- <refentry id="function.sin">
- <refnamediv>
- <refname>sin</refname>
- <refpurpose>Sine</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>float <function>sin</function></funcdef>
- <paramdef>float <parameter>arg</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the sine of arg in radians.
- </para>
- <para>
- See also <function>cos</function> and <function>tan</function>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.sqrt">
- <refnamediv>
- <refname>sqrt</refname>
- <refpurpose>Square root</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>float <function>sqrt</function></funcdef>
- <paramdef>float <parameter>arg</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the square root of <parameter>arg</parameter>.
- </para>
- </refsect1>
- </refentry>
-
- <refentry id="function.srand">
- <refnamediv>
- <refname>srand</refname>
- <refpurpose>Seed the random number generator</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>void <function>srand</function></funcdef>
- <paramdef>int <parameter>seed</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Seeds the random number generator with
- <parameter>seed</parameter>.
- <informalexample>
- <programlisting role="php">
-// seed with microseconds since last "whole" second
-srand ((double) microtime() * 1000000);
-$randval = rand();
- </programlisting>
- </informalexample>
- </para>
- <simpara>
- See also <function>rand</function>,
- <function>getrandmax</function>, <function>mt_rand</function>,
- <function>mt_srand</function>, and
- <function>mt_getrandmax</function>.
- </simpara>
- </refsect1>
- </refentry>
-
- <refentry id="function.tan">
- <refnamediv>
- <refname>tan</refname>
- <refpurpose>Tangent</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
- <funcsynopsis>
- <funcprototype>
- <funcdef>float <function>tan</function></funcdef>
- <paramdef>float <parameter>arg</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- <para>
- Returns the tangent of arg in radians.
- </para>
- <para>
- See also <function>sin</function> and <function>cos</function>.
- </para>
- </refsect1>
- </refentry>
-
- </reference>
-
-<!-- Keep this comment at the end of the file
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-sgml-default-dtd-file:"../../manual.ced"
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--->
+<reference id="ref.math">
+ <title>Mathematical Functions</title>
+ <titleabbrev>Math.</titleabbrev>
+ <partintro>
+ <sect1 id="math.intro">
+ <title>소개</title>
+ <para>
+ 이 수학 함수는 당신 컴퓨터의 long 과 double 형의 범위
+안에서만 값들을 다룬다.
+ 만약 더 큰 수를 다루고자 한다면 <link linkend="ref.bc">arbitrary
+precision math functions</link> 를 보라.
+ </para>
+ <sect2 id="math.constants">
+ <title>Math constants</title>
+ <para>
+ 다음의 값들은 PHP에서 math extension에 의해 정의된 상수
+이다.:
+ <table>
+ <title>Math constants</title>
+ <tgroup cols="3">
+ <thead>
+ <row>
+
+<entry>상수</entry>
+
+<entry>값</entry>
+
+<entry>설명</entry>
+ </row>
+ </thead>
+ <tbody>
+ <row>
+
+<entry>M_PI</entry>
+
+<entry>3.14159265358979323846</entry>
+
+<entry>Pi</entry>
+ </row>
+ <row>
+
+<entry>M_E</entry>
+
+<entry>2.7182818284590452354</entry>
+
+<entry>e</entry>
+ </row>
+ <row>
+
+<entry>M_LOG2E</entry>
+
+<entry>1.4426950408889634074</entry>
+ <entry>log_2
+e</entry>
+ </row>
+ <row>
+
+<entry>M_LOG10E</entry>
+
+<entry>0.43429448190325182765</entry>
+ <entry>log_10
+e</entry>
+ </row>
+ <row>
+
+<entry>M_LN2</entry>
+
+<entry>0.69314718055994530942</entry>
+ <entry>log_e
+2</entry>
+ </row>
+ <row>
+
+<entry>M_LN10</entry>
+
+<entry>2.30258509299404568402</entry>
+ <entry>log_e
+10</entry>
+ </row>
+ <row>
+
+<entry>M_PI_2</entry>
+
+<entry>1.57079632679489661923</entry>
+
+<entry>pi/2</entry>
+ </row>
+ <row>
+
+<entry>M_PI_4</entry>
+
+<entry>0.78539816339744830962</entry>
+
+<entry>pi/4</entry>
+ </row>
+ <row>
+
+<entry>M_1_PI</entry>
+
+<entry>0.31830988618379067154</entry>
+
+<entry>1/pi</entry>
+ </row>
+ <row>
+
+<entry>M_2_PI</entry>
+
+<entry>0.63661977236758134308</entry>
+
+<entry>2/pi</entry>
+ </row>
+ <row>
+
+<entry>M_SQRTPI</entry>
+
+<entry>1.77245385090551602729</entry>
+
+<entry>sqrt(pi) [4.0.2]</entry>
+ </row>
+ <row>
+
+<entry>M_2_SQRTPI</entry>
+
+<entry>1.12837916709551257390</entry>
+
+<entry>2/sqrt(pi)</entry>
+ </row>
+ <row>
+
+<entry>M_SQRT2</entry>
+
+<entry>1.41421356237309504880</entry>
+
+<entry>sqrt(2)</entry>
+ </row>
+ <row>
+
+<entry>M_SQRT3</entry>
+
+<entry>1.73205080756887729352</entry>
+ <entry>sqrt(3)
+[4.0.2]</entry>
+ </row>
+ <row>
+
+<entry>M_SQRT1_2</entry>
+
+<entry>0.70710678118654752440</entry>
+
+<entry>1/sqrt(2)</entry>
+ </row>
+ <row>
+
+<entry>M_LNPI</entry>
+
+<entry>1.14472988584940017414</entry>
+
+<entry>log_e(pi) [4.0.2]</entry>
+ </row>
+ <row>
+
+<entry>M_EULER</entry>
+
+<entry>0.57721566490153286061</entry>
+ <entry>Euler
+constant [4.0.2]</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+ PHP4RC1 까지는 단지 M_PI 만이 유용하며, 다른 모든 상수들은
+ PHP 4.0. 이후에 가능하다.
+ [4.0.2]라는 라벨이 붙은 상수는 PHP 4.0.2. 에서 추가된
+상수이다.
+ </para>
+ </sect2>
+ </sect1>
+ </partintro>
+ <refentry id="function.abs">
+ <refnamediv>
+ <refname>abs</refname>
+ <refpurpose>절대값</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>mixed <function>abs</function>
+ </funcdef>
+ <paramdef>mixed <parameter>number</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ 숫자의 절대값을 반환한다.
+ 인자로 온 숫자가 float 형이면 반환 타입도 역시 float 이며,
+이는 다른 형에 대해서도 동일하다.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.acos">
+ <refnamediv>
+ <refname>acos</refname>
+ <refpurpose>아크 코사인(Arc cosine)</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>float <function>acos</function>
+ </funcdef>
+ <paramdef>float <parameter>arg</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ <parameter>arg</parameter>의 아크 코사인(Arc
+cosine) 값을 라디인으로 반환한다.
+ </para>
+ <para>
+ <function>asin</function> 그리고
+<function>atan</function>을 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.asin">
+ <refnamediv>
+ <refname>asin</refname>
+ <refpurpose>아크 사인(Arc sine)</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>float <function>asin</function>
+ </funcdef>
+ <paramdef>float <parameter>arg</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ <parameter>arg</parameter>의 아크 사인(Arc sine)
+라디인으로 값을 반환한다.
+ </para>
+ <para>
+ <function>acos</function> 그리고
+<function>atan</function>을 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.atan">
+ <refnamediv>
+ <refname>atan</refname>
+ <refpurpose>아크 탄젠트(Arc tangent)</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>float <function>atan</function>
+ </funcdef>
+ <paramdef>float <parameter>arg</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ <parameter>arg</parameter>의 아크 탄젠트(Arc
+tangent)값을 라디인으로 반환한다.
+ </para>
+ <para>
+ <function>asin</function> 그리고
+<function>acos</function>을 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.atan2">
+ <refnamediv>
+ <refname>atan2</refname>
+ <refpurpose>두 변수의 아크 탄젠트(arc
+tangent)</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>float <function>atan2</function>
+ </funcdef>
+ <paramdef>float <parameter>y</parameter>
+ </paramdef>
+ <paramdef>float <parameter>x</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <simpara>
+ 이 함수는 두 변수 <parameter>x</parameter> 와
+<parameter>y</parameter>의
+ 아크 탄젠트(arc tangent) 값을 반환한다.
+ 이는 각 인자들의 부호가 결과의 4분구간을 결정하는데
+사용된다는 점을 제외하고는
+ <parameter>y</parameter> / <parameter>x</parameter>의
+ 아크 탄젠트 값을 계산하는 것과 동일하다.
+ </simpara>
+ <simpara>
+ 이 함수는 결과는 라디안으로 반환하는데 그 범위는 -PI
+보다 크거나 같고
+ PI 보다 작거나 같은 값의 범위가 된다.
+ </simpara>
+ <para>
+ <function>acos</function> 그리고
+<function>atan</function>을 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.base-convert">
+ <refnamediv>
+ <refname>base_convert</refname>
+ <refpurpose>임의의 베이스(arbitrary bases) 사이에서
+숫자를 변환한다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>string
+<function>base_convert</function>
+ </funcdef>
+ <paramdef>string <parameter>number</parameter>
+ </paramdef>
+ <paramdef>int <parameter>frombase</parameter>
+ </paramdef>
+ <paramdef>int <parameter>tobase</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ <parameter>number</parameter>에 해당하는 문자열
+ <parameter>tobase</parameter> 베이스로 바꾸어 반환한다.
+ <parameter>number</parameter>의 베이스는
+ <parameter>frombase</parameter>에서 명시된다.
+ <parameter>frombase</parameter> 와 <parameter>tobase</parameter>는
+ 둘 다 2 보다 크거나 같고 36 보다 작거나 같은 값이 와야
+한다.
+ 10 보다 큰 숫자(digit) a에서 z 까지의 문자로 나타내며,
+ a 는 10을 b는 11을 그리고 z는 35에 해당하는 숫자를
+나타낸다.
+ <example>
+ <title>
+ <function>Base_convert</function>
+ </title>
+ <programlisting role="php">
+$binary = base_convert ($hexadecimal, 16, 2);
+</programlisting>
+ </example>
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.bindec">
+ <refnamediv>
+ <refname>bindec</refname>
+ <refpurpose>2진수를 10진수로 바꾼다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>int <function>bindec</function>
+ </funcdef>
+ <paramdef>string
+<parameter>binary_string</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ 2진 문자열 에 의해 표현되는 2진수를 동일한 10진수로
+반환한다.
+ </para>
+ <para>
+ bindec 는 2진수를 10진수로 변환한다.
+ 변환될 수 있는 가장 큰 수는 1의
+31비트(1111111111111111111111111111111),
+ 십진수로 2147483647 이다.
+ </para>
+ <para>
+ <function>decbin</function> 함수를 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.ceil">
+ <refnamediv>
+ <refname>ceil</refname>
+ <refpurpose>올림한다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>int <function>ceil</function>
+ </funcdef>
+ <paramdef>float <parameter>number</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ <parameter>number</parameter>보다 크거나 같은
+가장 큰 정수를 반환한다.(올림)
+ 정수에 <function>ceil</function>를 쓰는 것은 시간 낭비일
+뿐이다.
+ <informalexample>
+ <programlisting role="php">
+$x = ceil(4.25);
+// $x=5 의 값을 갖는다.
+ </programlisting>
+ </informalexample>
+ </para>
+ <simpara>
+ 주의: PHP/FI 2 의 <function>ceil</function> 함수는 float 형을
+반환했다.
+ 사용: PHP/FI 2 의 결과를 얻기 위해 <literal>$new =
+(double)ceil($number);</literal> 를 사용하라.
+ </simpara>
+ <simpara>
+ <function>floor</function> 그리고
+ <function>round</function>를 참고하라.
+ </simpara>
+ </refsect1>
+ </refentry>
+ <refentry id="function.cos">
+ <refnamediv>
+ <refname>cos</refname>
+ <refpurpose>코사인</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>float <function>cos</function>
+ </funcdef>
+ <paramdef>float <parameter>arg</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ arg의 코사인 값을 라디안으로 반환한다.
+ </para>
+ <para>
+ See also <function>sin</function> and <function>tan</function>.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.decbin">
+ <refnamediv>
+ <refname>decbin</refname>
+ <refpurpose>10진수를 2진수로</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>string <function>decbin</function>
+ </funcdef>
+ <paramdef>int <parameter>number</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ 주어진 숫자를 2진표현을 포함하는 문자열로 반환한다.
+ 변환될 수 있는 가장 큰 수는 십진수로 2147483647 이므로
+ 결과는 1의 31비트(1111111111111111111111111111111)가 된다.
+ </para>
+ <para>
+ <function>bindec</function> 함수를 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.dechex">
+ <refnamediv>
+ <refname>dechex</refname>
+ <refpurpose>10진수를 16진수로</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>string <function>dechex</function>
+ </funcdef>
+ <paramdef>int <parameter>number</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ 주어진 숫자를 16진수를 표현하는 문자열로 반환한다.
+ 변환될 수 있는 가장 큰 수는 십진수로 2147483647이므로
+ 결과는 16진수로 "7fffffff" 가 된다.
+ </para>
+ <para>
+ See also the <function>hexdec</function> function.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.decoct">
+ <refnamediv>
+ <refname>decoct</refname>
+ <refpurpose>십진수를 8진수로</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>string <function>decoct</function>
+ </funcdef>
+ <paramdef>int <parameter>number</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ 주어진 숫자를 8진수 형태로 표현하는 문자열을 반환한다.
+ 변환될 수 있는 가장 큰 수는 십진수로 2147483647이며
+ 결과는 "17777777777" 이 된다.
+ </para>
+ <para>
+ <function>octdec</function>를 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.deg2rad">
+ <refnamediv>
+ <refname>deg2rad</refname>
+ <refpurpose>
+ 각도(degree)를 동일한 라디안 값으로 변환한다.
+ </refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>double <function>deg2rad</function>
+ </funcdef>
+ <paramdef>double <parameter>number</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ 이 함수는 <parameter>number</parameter>를 각도(degree)에서 동일한
+라디안 값으로 변환한다.
+ </para>
+ <para>
+ <function>rad2deg</function>를 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.exp">
+ <refnamediv>
+ <refname>exp</refname>
+ <refpurpose>e 의 승수</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>float <function>exp</function>
+ </funcdef>
+ <paramdef>float <parameter>arg</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ e(2.718...)의 <parameter>arg</parameter>승을 반환한다.
+ </para>
+ <para>
+ <function>pow</function>을 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.floor">
+ <refnamediv>
+ <refname>floor</refname>
+ <refpurpose>값을 내림한다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>int <function>floor</function>
+ </funcdef>
+ <paramdef>float <parameter>number</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <simpara>
+ <parameter>number</parameter>보다 작거나 같은 가장 작은 정수를
+반환한다.
+ <function>floor</function>에 정수를 사용하는 것은 시간 낭비일
+뿐이다.
+ </simpara>
+ <simpara>
+ 주의 : PHP/FI 2 에서 <function>floor</function>는 float 형을
+반환했다.
+ 이 버젼의 효과를 내기 위해 <literal>$new =
+(double)floor($number);</literal>를 사용하라.
+ </simpara>
+ <simpara>
+ <function>ceil</function> 그리고
+ <function>round</function>를 참고하라.
+ </simpara>
+ </refsect1>
+ </refentry>
+ <refentry id="function.getrandmax">
+ <refnamediv>
+ <refname>getrandmax</refname>
+ <refpurpose>가능한 가장 큰 임의이 값을
+보여준다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>int <function>getrandmax</function>
+ </funcdef>
+ <paramdef>void </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <simpara>
+ <function>rand</function> 함수의 호출에 의해 받을 수 있는 가장
+큰 값을 반환한다.
+ </simpara>
+ <simpara>
+ <function>rand</function>, <function>srand</function>,
+ <function>mt_rand</function>, <function>mt_srand</function>, 그리고
+ <function>mt_getrandmax</function>을 참고하라.
+ </simpara>
+ </refsect1>
+ </refentry>
+ <refentry id="function.hexdec">
+ <refnamediv>
+ <refname>hexdec</refname>
+ <refpurpose>16진수를 10진수로 변환한다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>int <function>hexdec</function>
+ </funcdef>
+ <paramdef>string
+<parameter>hex_string</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ 16진수 숫자에 해당하는 10진수 값을 10진수 형태로
+반환한다.
+ HecDec는 16진수 문자열을 10진수 문자열로 변환하며,
+ 변환될 수 있는 가장 큰 수는 7fffffff 이거나 10진수로
+2147483647 이다.
+ </para>
+ <para>
+ <function>dechex</function>함수를 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.lcg-value">
+ <refnamediv>
+ <refname>lcg_value</refname>
+ <refpurpose>Combined linear congruential generator</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>Description</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>double <function>lcg_value</function>
+ </funcdef>
+ <void/>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ <function>lcg_value</function>는 (0, 1) 사이의 의사 랜덤 숫자(pseudo
+number)를 반환한다.
+ 이 함수는 2^31 - 85 와 2^31 - 249 사이의 두개의 CG를 조합한다.
+ 이 함수의 구간은 두 소수의 산물과 일치한다.
+ (The period of this function is equal to the product of both primes.)
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.log">
+ <refnamediv>
+ <refname>log</refname>
+ <refpurpose>자연로그</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>float <function>log</function>
+ </funcdef>
+ <paramdef>float <parameter>arg</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ arg의 자연로그를 반환한다.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.log10">
+ <refnamediv>
+ <refname>log10</refname>
+ <refpurpose>상용로그</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>float <function>log10</function>
+ </funcdef>
+ <paramdef>float <parameter>arg</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ <parameter>arg</parameter>의 사용로그 값을 반환한다.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.max">
+ <refnamediv>
+ <refname>max</refname>
+ <refpurpose>가장 큰 값을 찾는다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>mixed <function>max</function>
+ </funcdef>
+ <paramdef>mixed <parameter>arg1</parameter>
+ </paramdef>
+ <paramdef>mixed <parameter>arg2</parameter>
+ </paramdef>
+ <paramdef>mixed <parameter>argn</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ <function>max</function>는 매개 변수의 값 중 숫자로 표시되는
+가장 큰 값을 반환한다.
+ </para>
+ <para>
+ 처음 매개변수가 배열이라면, <function>max</function>는
+ 그 배열에 있는 값 중 가장 큰 값을 반환한다.
+ 처음 매개변수가 정수, 문자열 혹은 더블형이라면,
+ 최소한 두개의 매개 변수가 필요하며, <function>max</function> 는
+ 이 값들 중 가장 큰 값을 반환한다.
+ 비교되는 값들의 수는 무재한이다.
+ </para>
+ <para>
+ 하나 혹은 그 이상의 값이 더블형이라며느 모든 값은
+더블형으로 여겨지며,
+ 더블형이 반환된다.
+ 어느것 하나도 더블형이 아니면, 모든 것이 정수로
+여겨지며, 정수형이 반환된다.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.min">
+ <refnamediv>
+ <refname>min</refname>
+ <refpurpose>가장 작은 값을 찾는다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>mixed <function>min</function>
+ </funcdef>
+ <paramdef>mixed <parameter>arg1</parameter>
+ </paramdef>
+ <paramdef>mixed <parameter>arg2</parameter>
+ </paramdef>
+ <paramdef>mixed <parameter>argn</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ <function>Min</function>는 매개변수의 값 중 숫자로 표시되는
+가장 작은 값을 반환한다.
+ </para>
+ <para>
+ 처음 매개변수가 배열이라면, <function>min</function>은
+ 그 배열에 있는 값 중 가장 작은 값을 반환한다.
+ 처음 매개변수가 정수, 문자열 혹은 더블형이라면,
+ 최소한 두개의 매개 변수가 필요하며, <function>min</function>은
+ 이 값들 중 가장 작은 값을 반환한다.
+ 비교되는 값들의 수는 무재한이다.
+ </para>
+ <para>
+ 하나 혹은 그 이상의 값이 더블형이라며느 모든 값은
+더블형으로 여겨지며,
+ 더블형이 반환된다.
+ 어느것 하나도 더블형이 아니면, 모든 것이 정수로
+여겨지며, 정수형이 반환된다.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.mt-rand">
+ <refnamediv>
+ <refname>mt_rand</refname>
+ <refpurpose>더 좋은 랜덤값을 생성한다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>int <function>mt_rand</function>
+ </funcdef>
+ <paramdef>int
+ <parameter>
+ <optional>min</optional>
+ </parameter>
+ </paramdef>
+ <paramdef>int
+ <parameter>
+ <optional>max</optional>
+ </parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <simpara>
+ 예전 libc의 많은 난수 생성기는 모호하거나 혹은
+ unknown characteristics를 갖고 있으며 느리다.
+ 기본적으로 PHP의 <function>rand</function>함수는
+ libc 난수 생성기를 사용한다.
+ <function>mt_rand</function> 함수는 이를 위한
+ 드롭-인 교체(drop-in replacement) 이다.
+ 이 함수는 난수 발생기로 known characteristics를 사용하며,
+ Many random number generators of older libcs have or
+ unknown characteristics and are slow. By default, PHP uses the
+ libc random number generator with the <function>rand</function>
+ function. <function>mt_rand</function> function is a drop-in
+ replacement for this. It uses a random number generator with
+ known characteristics, the Mersenne Twister, which will produce
+ random numbers that should be suitable for seeding some kinds
+ of cryptography (see the home pages for details) and is four
+ times faster than what the average libc provides. The Homepage
+ of the Mersenne Twister can be found at
+ <ulink url="&url.mersenne;">&url.mersenne;</ulink>, and an
+ optimized version of the MT source is available from
+ <ulink url="&url.mersenne.twister;">&url.mersenne.twister;
+ </ulink>.
+ </simpara>
+ <simpara>
+ If called without the optional <parameter>min</parameter>,
+ <parameter>max</parameter> arguments <function>mt_rand</function>
+ returns a pseudo-random value between 0 and
+ <constant>RAND_MAX</constant>. If you want a random number
+ between 5 and 15 (inclusive), for example, use <literal>mt_rand
+ (5, 15)</literal>.
+ </simpara>
+ <simpara>
+ Remember to seed the random number generator before use with
+ <function>mt_srand</function>.
+ </simpara>
+ <note>
+ <para>
+ In versions before 3.0.7 the meaning of
+ <parameter>max</parameter> was <parameter>range</parameter>. To
+ get the same results in these versions the short example should
+ be <literal>mt_rand (5, 11)</literal> to get a random number
+ between 5 and 15.
+ </para>
+ </note>
+ <simpara>
+ See also <function>mt_srand</function>,
+ <function>mt_getrandmax</function>, <function>srand</function>,
+ <function>rand</function> and <function>getrandmax</function>.
+ </simpara>
+ </refsect1>
+ </refentry>
+ <refentry id="function.mt-srand">
+ <refnamediv>
+ <refname>mt_srand</refname>
+ <refpurpose>Seed the better random number
+generator</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>Description</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>void <function>mt_srand</function>
+ </funcdef>
+ <paramdef>int <parameter>seed</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ Seeds the random number generator with
+ <parameter>seed</parameter>.
+ <informalexample>
+ <programlisting role="php">
+// seed with microseconds since last "whole" second
+mt_srand ((double) microtime() * 1000000);
+$randval = mt_rand();
+ </programlisting>
+ </informalexample>
+ </para>
+ <simpara>
+ See also <function>mt_rand</function>,
+ <function>mt_getrandmax</function>, <function>srand</function>,
+ <function>rand</function>, and
+ <function>getrandmax</function>.
+ </simpara>
+ </refsect1>
+ </refentry>
+ <refentry id="function.mt-getrandmax">
+ <refnamediv>
+ <refname>mt_getrandmax</refname>
+ <refpurpose>가장 큰 랜덤값을 보여준다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>int <function>mt_getrandmax</function>
+ </funcdef>
+ <paramdef>void </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <simpara>
+ <function>mt_rand</function>의 호출에 의해 반환될 수 있는 가장
+큰 값을 반환한다.
+ </simpara>
+ <simpara>
+ <function>mt_rand</function>,
+ <function>mt_srand</function>
+ <function>rand</function>,
+ <function>srand</function>, 그리고
+ <function>getrandmax</function>을 참고하라.
+ </simpara>
+ </refsect1>
+ </refentry>
+ <refentry id="function.number-format">
+ <refnamediv>
+ <refname>number_format</refname>
+ <refpurpose>숫자를 천단위로 묶어서
+표현한다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>string
+<function>number_format</function>
+ </funcdef>
+ <paramdef>float <parameter>number</parameter>
+ </paramdef>
+ <paramdef>int <parameter>decimals</parameter>
+ </paramdef>
+ <paramdef>string
+<parameter>dec_point</parameter>
+ </paramdef>
+ <paramdef>string
+<parameter>thousands_sep</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ <function>Number_format</function>은 <parameter>number</parameter>의
+정형화된 형테를 반환한다.
+ 이 함수는 하나, 두개 혹은 네개(세개는 올 수 없다.)의
+매개변수를 가질 수 있다.
+ </para>
+ <para>
+ 하나의 매개변수만 주어지면, 그냥 숫자가 아닌 매
+천단위마다 콤마(",")를 가진 형태가 반환된다.
+ (역자주:소수 이하자리는 반올림 된다.)
+ </para>
+ <para>
+ 두개의 매개변수가 주어지면, <parameter>number</parameter>는
+ <parameter>decimals</parameter>자리 소수점을 가지고 천단위마다
+콤마(",")가
+ 붙은 형태가 반환된다.
+ </para>
+ <para>
+ 매개변수 4개가 주어지면, <parameter>number</parameter>는
+ <parameter>decimals</parameter>자리의 소수점을 갖고,
+ dot(".") 대신 <parameter>dec_point</parameter>개 대체되며,
+ 천단위 마다 사용 된 콤마 (",") 대신
+<parameter>thousands_sep</parameter>가
+ 적용된 형태가 반환된다.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.octdec">
+ <refnamediv>
+ <refname>octdec</refname>
+ <refpurpose>8진수를 10진수로</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>int <function>octdec</function>
+ </funcdef>
+ <paramdef>string
+<parameter>octal_string</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ 8진수 형태로 표현되는 octal_string 인자를 이해 해당하는
+8진수와 동등한
+ 10진수로 반환한다.
+ OctDec는 8진수를 10진수로 반환한다.
+ 변환될 수 있는 가장 큰 값은 17777777777 혹은 10진수로
+2147483647 이다.
+ </para>
+ <para>
+ <function>decoct</function>를 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.pi">
+ <refnamediv>
+ <refname>pi</refname>
+ <refpurpose>파이(pi)값을 얻는다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>double <function>pi</function>
+ </funcdef>
+ <paramdef>void </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <simpara>
+ 파이(pi)의 근사값을 반환한다.
+ </simpara>
+ </refsect1>
+ </refentry>
+ <refentry id="function.pow">
+ <refnamediv>
+ <refname>pow</refname>
+ <refpurpose>거듭제곱</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>float <function>pow</function>
+ </funcdef>
+ <paramdef>float <parameter>base</parameter>
+ </paramdef>
+ <paramdef>float <parameter>exp</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ <parameter>base</parameter>의 <parameter>exp</parameter>승 값을
+반환한다.
+ </para>
+ <para>
+ <function>exp</function>을 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.rad2deg">
+ <refnamediv>
+ <refname>rad2deg</refname>
+ <refpurpose>
+ 라디안을 각도로 변환한다.
+ </refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>double <function>rad2deg</function>
+ </funcdef>
+ <paramdef>double <parameter>number</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ 이 함수는 <parameter>number</parameter>을 라디안에서 각도로
+변환한다.
+ </para>
+ <para>
+ <function>deg2rad</function>을 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.rand">
+ <refnamediv>
+ <refname>rand</refname>
+ <refpurpose>난수를 발생한다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>int <function>rand</function>
+ </funcdef>
+ <paramdef>
+ <parameter>
+ <optional>int min</optional>
+ </parameter>
+ </paramdef>
+ <paramdef>
+ <parameter>
+ <optional>int max</optional>
+ </parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <simpara>
+ <parameter>min</parameter>없이 호출되면,
+ If called without the optional <parameter>min</parameter>,
+ <parameter>max</parameter> arguments <function>rand</function>
+ returns a pseudo-random value between 0 and
+ <constant>RAND_MAX</constant>. If you want a random number
+ between 5 and 15 (inclusive), for example, use <literal>rand (5,
+ 15)</literal>.
+ </simpara>
+ <simpara>
+ Remember to seed the random number generator before use with
+ <function>srand</function>.
+ </simpara>
+ <note>
+ <para>
+ In versions before 3.0.7 the meaning of
+ <parameter>max</parameter> was <parameter>range</parameter>. To
+ get the same results in these versions the short example should
+ be <literal>rand (5, 11)</literal> to get a random number
+ between 5 and 15.
+ </para>
+ </note>
+ <simpara>
+ See also <function>srand</function>,
+ <function>getrandmax</function>, <function>mt_rand</function>,
+ <function>mt_srand</function>, and
+ <function>mt_getrandmax</function>.
+ </simpara>
+ </refsect1>
+ </refentry>
+ <refentry id="function.round">
+ <refnamediv>
+ <refname>round</refname>
+ <refpurpose>실수를 반올림한다.</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>double <function>round</function>
+ </funcdef>
+ <paramdef>double <parameter>val</parameter>
+ </paramdef>
+ <paramdef>int
+ <parameter>
+ <optional>precision</optional>
+ </parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ 소수점 <parameter>precision</parameter> 자리(소수점 이후의
+자리수)까지
+ <parameter>val</parameter>을 반올림한다.
+ <informalexample>
+ <programlisting role="php">
+$foo = round (3.4); // $foo == 3.0
+$foo = round (3.5); // $foo == 4.0
+$foo = round (3.6); // $foo == 4.0
+
+$foo = round (1.95583, 2); // $foo == 1.96
+ </programlisting>
+ </informalexample>
+ </para>
+ <note>
+ <simpara>
+ <parameter>precision</parameter> 는 PHP 4 에서만
+유용하다.
+ </simpara>
+ </note>
+ <simpara>
+ <function>ceil</function> 그리고
+ <function>floor</function>을 참고하라.
+ </simpara>
+ </refsect1>
+ </refentry>
+ <refentry id="function.sin">
+ <refnamediv>
+ <refname>sin</refname>
+ <refpurpose>사인</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>float <function>sin</function>
+ </funcdef>
+ <paramdef>float <parameter>arg</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ arg의 사인값을 라디안으로 반환한다.
+ </para>
+ <para>
+ <function>cos</function> 그리고 <function>tan</function>을 참고하라.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.sqrt">
+ <refnamediv>
+ <refname>sqrt</refname>
+ <refpurpose>평방제곱근(루트)</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>설명</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>float <function>sqrt</function>
+ </funcdef>
+ <paramdef>float <parameter>arg</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ <parameter>arg</parameter>의 평방제곱근을 반환한다.
+ </para>
+ </refsect1>
+ </refentry>
+ <refentry id="function.srand">
+ <refnamediv>
+ <refname>srand</refname>
+ <refpurpose>Seed the random number generator</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>Description</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>void <function>srand</function>
+ </funcdef>
+ <paramdef>int <parameter>seed</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ Seeds the random number generator with
+ <parameter>seed</parameter>.
+ <informalexample>
+ <programlisting role="php">
+// seed with microseconds since last "whole" second
+srand ((double) microtime() * 1000000);
+$randval = rand();
+ </programlisting>
+ </informalexample>
+ </para>
+ <simpara>
+ See also <function>rand</function>,
+ <function>getrandmax</function>, <function>mt_rand</function>,
+ <function>mt_srand</function>, and
+ <function>mt_getrandmax</function>.
+ </simpara>
+ </refsect1>
+ </refentry>
+ <refentry id="function.tan">
+ <refnamediv>
+ <refname>tan</refname>
+ <refpurpose>Tangent</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>Description</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>float <function>tan</function>
+ </funcdef>
+ <paramdef>float <parameter>arg</parameter>
+ </paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <para>
+ Returns the tangent of arg in radians.
+ </para>
+ <para>
+ See also <function>sin</function> and <function>cos</function>.
+ </para>
+ </refsect1>
+ </refentry>
+</reference>
+<!-- Keep this comment at the end of the file
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+mode: sgml
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