Hello, I'm back :)
I don't think the $a{1} style is deprecated.. I don't really remember of
that decision on the internals mailing list. The E_STRICT warning was even
removed.
I think we need to double-check this one.
Nuno
----- Original Message -----
philip Thu Aug 31 01:57:26 2006 UTC
Modified files:
/phpdoc/en/language types.xml
Log:
$string{42} is indeed deprecated as of PHP 6, so let's document that.
Also, removed "string offset" information from the "type juggling"
section.
This also closes bug #38645
http://cvs.php.net/viewvc.cgi/phpdoc/en/language/types.xml?r1=1.166&r2=1.167&diff_format=u
Index: phpdoc/en/language/types.xml
diff -u phpdoc/en/language/types.xml:1.166
phpdoc/en/language/types.xml:1.167
--- phpdoc/en/language/types.xml:1.166 Thu May 4 02:21:28 2006
+++ phpdoc/en/language/types.xml Thu Aug 31 01:57:26 2006
@@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.166 $ -->
+<!-- $Revision: 1.167 $ -->
<chapter id="language.types">
<title>Types</title>
@@ -1090,7 +1090,8 @@
<note>
<simpara>
They may also be accessed using braces like
<varname>$str{42}</varname>
- for the same purpose. However, using square array-brackets is
preferred.
+ for the same purpose. However, using square array-brackets is
preferred
+ because the {braces} style is deprecated as of PHP 6.
</simpara>
</note>
<para>
@@ -1114,7 +1115,7 @@
$str = 'Look at the sea';
$str[strlen($str)-1] = 'e';
-// Alternative method using {}
+// Alternative method using {} is deprecated as of PHP 6
$third = $str{2};
?>
@@ -2446,41 +2447,22 @@
undefined.
</para>
<para>
+ Also, because PHP supports indexing into strings via offsets using
+ the same syntax as array indexing, the following example holds true
+ for all PHP versions:
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
-$a = "1"; // $a is a string
-$a[0] = "f"; // What about string offsets? What happens?
+$a = 'car'; // $a is a string
+$a[0] = 'b'; // $a is still a string
+echo $a; // bar
?>
]]>
</programlisting>
</informalexample>
</para>
<para>
- Since PHP (for historical reasons) supports indexing into strings
- via offsets using the same syntax as array indexing, the example
- above leads to a problem: should $a become an array with its first
- element being "f", or should "f" become the first character of the
- string $a?
- </para>
- <para>
- The current versions of PHP interpret the second assignment as
- a string offset identification, so $a becomes "f", the result
- of this automatic conversion however should be considered
- undefined. PHP 4 introduced the new curly bracket syntax to access
- characters in string, use this syntax instead of the one presented
- above:
- <informalexample>
- <programlisting role="php">
-<![CDATA[
-<?php
-$a = "abc"; // $a is a string
-$a{1} = "f"; // $a is now "afc"
-?>
-]]>
- </programlisting>
- </informalexample>
See the section titled <link
linkend="language.types.string.substr">String
access by character</link> for more information.
</para>
