php-general Digest 16 Mar 2013 07:55:12 -0000 Issue 8165
php-general Digest 16 Mar 2013 07:55:12 - Issue 8165
Topics (messages 320586 through 320605):
Re: variable type - conversion/checking
320586 by: Ashley Sheridan
320589 by: richard gray
320591 by: Jim Lucas
320592 by: tamouse mailing lists
320596 by: Ashley Sheridan
320598 by: Andrew Ballard
320599 by: Sebastian Krebs
320600 by: Sebastian Krebs
320601 by: Andrew Ballard
320602 by: Andrew Ballard
320603 by: Matijn Woudt
320604 by: tamouse mailing lists
Re: PHP context editor
320587 by: Ashley Sheridan
320593 by: tamouse mailing lists
320595 by: Curtis Maurand
320597 by: Curtis Maurand
Re: Accessing Files Outside the Web Root
320588 by: Ashley Sheridan
Re: PDO Transaction
320590 by: Lester Caine
320605 by: Simon Dániel
Re: rather a HTML Q; however 2-FRAME
320594 by: tamouse mailing lists
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---BeginMessage---
On Fri, 2013-03-15 at 04:57 -0500, tamouse mailing lists wrote:
On Fri, Mar 15, 2013 at 3:55 AM, Peter Ford p...@justcroft.com wrote:
On 15/03/13 06:21, Jim Lucas wrote:
On 3/14/2013 4:05 PM, Matijn Woudt wrote:
On Thu, Mar 14, 2013 at 11:44 PM, Jim Lucas li...@cmsws.com wrote:
On 03/14/2013 11:50 AM, Samuel Lopes Grigolato wrote:
Something like if (is_numeric($var) $var == floor($var)) will do
the
trick. I don't know if there's a better (more elegant) way.
On Thu, Mar 14, 2013 at 3:09 PM, Matijn Woudttijn...@gmail.com wrote:
On Thu, Mar 14, 2013 at 7:02 PM, georggeorg.chamb...@telia.com**
wrote:
Hi,
I have tried to find a way to check if a character string is
possible to
test whether it is convertible to an intger !
any suggestion ?
BR georg
You could use is_numeric for that, though it also accepts floats.
- Matijn
for that type of test I have always used this:
if ( $val == (int)$val ) {
http://www.php.net/manual/en/**language.types.integer.php#**
language.types.integer.castinghttp://www.php.net/manual/en/language.types.integer.php#language.types.integer.casting
I hope you're not serious about this...
When comparing a string and an int, PHP will translate the string to int
too, and of course they will always be equal then.
So:
$a = abc;
if($a == (int)$a) echo YES;
else echo NO;
Will always return YES.
- Matijn
H... Interesting. Looking back at my code base where I thought I was
doing that, turns out the final results were not that, but this:
$value = asdf1234;
if ( $value === (string)intval($value) ) {
Looking back at the OP's request and after a little further searching,
it seems that there might be a better possible solution for what the OP
is requesting.
?php
$values = array(asdf1234, 123.123, 123);
foreach ( $values AS $value ) {
echo $value;
if ( ctype_digit($value) ) {
echo ' - is all digits';
} else {
echo ' - is NOT all digits';
}
echo 'br /'.PHP_EOL;
}
returns...
asdf1234 - is NOT all digits
123.123 - is NOT all digits
123 - is all digits
http://www.php.net/manual/en/function.ctype-digit.php
An important note:
This function expects a string to be useful, so for example passing in
an integer may not return the expected result. However, also note that
HTML forms will result in numeric strings and not integers. See also the
types section of the manual.
--
Jim
Integers can be negative too: I suspect your test would reject a leading
'-'...
For my money, `is_numeric()` does just what I want.
The thing is, is_numeric() will not check if a string is a valid int,
but any valid number, including a float.
For something like this, wouldn't a regex be better?
if(preg_match('/^\-?\d+$/', $string))
echo int
Thanks,
Ash
http://www.ashleysheridan.co.uk
---End Message---
---BeginMessage---
On 15/03/2013 22:00, Ashley Sheridan wrote:
On Fri, 2013-03-15 at 04:57 -0500, tamouse mailing lists wrote:
For my money, `is_numeric()` does just what I want.
The thing is, is_numeric() will not check if a string is a valid int,
but any valid number, including a float.
For something like this, wouldn't a regex be better?
if(preg_match('/^\-?\d+$/', $string))
echo int
I'm late in on this thread so apologies if I have missed something here
.. but wouldn't is_int() do what the OP wants?
rich
---End Message---
---BeginMessage---
On 03/15/2013 02:33 PM, richard gray wrote:
On 15/03/2013 22:00, Ashley Sheridan wrote:
On Fri, 2013-03-15 at 04:57 -0500, tamouse mailing lists
Re: [PHP] variable type - conversion/checking
On Fri, Mar 15, 2013 at 8:34 PM, Ashley Sheridan a...@ashleysheridan.co.uk wrote: On Thu, Mar 14, 2013 at 7:02 PM, georggeorg.chamb...@telia.com** I have tried to find a way to check if a character string is possible to test whether it is convertible to an intger ! The op wasn't about casting a string to an int but detecting if a string was just a string representation of an int. Hence using a regex to determine that. Regular expressions are not just about giving feedback to the user. Seemed to me that was exactly what it was about. Thanks, Ash http://www.ashleysheridan.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] PDO Transaction
2013/3/15 Lester Caine les...@lsces.co.uk Simon Dániel wrote: Hi, I have a trouble with PDO transactions. I would like to start using transactions, but I am not familiar with it. I have got a 'There is no active transaction' exception, however, I am using beginTransaction method, and also I have set PDO::ATTR_AUTOCOMMIT to false right after connecting to the database. In my whole code I have used the commit method only once. Between beginTransaction and commit methods, as far as I know, I did not use anything that could activate auto-commit. In my test code, there is only an exec method of PDO, and an execute of PDOStatement. Maybe one of these activated auto-commit? And what are the possible commands which are able to activate auto-commit? I know that the commit method can do that, but - as I already wrote - I have issued it only once, and it is in the destructor of a singleton class. So what could be the problem? You don't say which database you are trying to access. Not all actually support transactions, and some need a connection correctly set. I am using MySQL.
[PHP] FW: No Subject
http://www.coachholidays.co.uk/ramlm/hfoqauyyvomdvio.kaxkucbebccxpzq
Re: [PHP] variable type - conversion/checking
On Fri, 2013-03-15 at 22:32 -0400, Andrew Ballard wrote: Guess regex are the only useful solution here. When you consider to use built-in functions, just remember, that for example '0xAF' is an integer too, but '42.00' isn't. Shoot...I hadn't considered how PHP might handle hex or octal strings when casting to int. (Again, not in front of a computer where I can test it right now. ) Regexes have problems with more than 9 digits for 32-bit ints. I guess to some degree it depends on how likely you are to experience values that large. Andrew Do they? Regex's deal with strings, so I don't see why they should have such issues. I've certainly never come across that problem, or heard of it before. Thanks, Ash http://www.ashleysheridan.co.uk
Re: [PHP] PDO Transaction
Simon Dániel wrote: 2013/3/15 Lester Caine les...@lsces.co.uk Simon Dániel wrote: Hi, I have a trouble with PDO transactions. I would like to start using transactions, but I am not familiar with it. I have got a 'There is no active transaction' exception, however, I am using beginTransaction method, and also I have set PDO::ATTR_AUTOCOMMIT to false right after connecting to the database. In my whole code I have used the commit method only once. Between beginTransaction and commit methods, as far as I know, I did not use anything that could activate auto-commit. In my test code, there is only an exec method of PDO, and an execute of PDOStatement. Maybe one of these activated auto-commit? And what are the possible commands which are able to activate auto-commit? I know that the commit method can do that, but - as I already wrote - I have issued it only once, and it is in the destructor of a singleton class. So what could be the problem? You don't say which database you are trying to access. Not all actually support transactions, and some need a connection correctly set. I am using MySQL. Have you read the warning on http://php.net/manual/en/ref.pdo-mysql.php? It would be of more use if it actually identified what works and what does not :( I think you need to be running in the InnoDB engine to get transactions? MyISAM will throw errors on transactions. -- Lester Caine - G8HFL - Contact - http://lsces.co.uk/wiki/?page=contact L.S.Caine Electronic Services - http://lsces.co.uk EnquirySolve - http://enquirysolve.com/ Model Engineers Digital Workshop - http://medw.co.uk Rainbow Digital Media - http://rainbowdigitalmedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Type of a variable in PHP
Thanks Nora On Fri, Mar 15, 2013 at 4:34 PM, Sebastian Krebs krebs@gmail.comwrote: 2013/3/15 Kevin Peterson qh.res...@gmail.com Have two questions - 1. How to find type of a variable in PHP. gettype(), or one of the is_*()-functions. But for me more interesting for me: Why do you _need_ this? 2. How to find the type of an array in PHP. An array is of type array :) is_array() or again gettype(). Can you maybe describe what you want to achieve? In a dynamically typed language it is rarely _required_, that you know the _concrete_ type. Please help. -- github.com/KingCrunch
Re: [PHP] Type of a variable in PHP
Try this
function get_type($var)
{
if(is_object($var))
return get_class($var);
if(is_null($var))
return 'null';
if(is_string($var))
return 'string';
if(is_array($var))
return 'array';
if(is_int($var))
return 'integer';
if(is_bool($var))
return 'boolean';
if(is_float($var))
return 'float';
if(is_resource($var))
return 'resource';
//throw new NotImplementedException();
return 'unknown';
}
On Fri, Mar 15, 2013 at 3:28 PM, Karim Geiger gei...@b1-systems.de wrote:
Hi,
On Fri, 2013-03-15 at 09:55 +, Kevin Peterson wrote:
Have two questions -
1. How to find type of a variable in PHP.
2. How to find the type of an array in PHP.
Please help.
Use this:
http://php.net/manual/en/function.gettype.php
Regards
Karim
--
Karim Geiger
B1 Systems GmbH
Osterfeldstraße 7 / 85088 Vohburg / http://www.b1-systems.de
GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt,HRB 3537
Re: [PHP] variable type - conversion/checking
On Mar 16, 2013 6:14 AM, Ashley Sheridan a...@ashleysheridan.co.uk wrote: On Fri, 2013-03-15 at 22:32 -0400, Andrew Ballard wrote: Guess regex are the only useful solution here. When you consider to use built-in functions, just remember, that for example '0xAF' is an integer too, but '42.00' isn't. Shoot...I hadn't considered how PHP might handle hex or octal strings when casting to int. (Again, not in front of a computer where I can test it right now. ) Regexes have problems with more than 9 digits for 32-bit ints. I guess to some degree it depends on how likely you are to experience values that large. Andrew Do they? Regex's deal with strings, so I don't see why they should have such issues. I've certainly never come across that problem, or heard of it before. Thanks, Ash http://www.ashleysheridan.co.uk Sure. If the string is nine or fewer digits, they can all be 0-9. If it is 10 digits, the first digit can only be 1-2. If it's 1, the remaining nine digits can still be 0-9, but if the first digit is 2, the second digit can only be 0-1. If the second digit is 0, the remaining eight digits can still be 0-9, but if it is 1, the third digit can only be 0-4. If the third digit is 0-3, the remaining seven digits can still be 0-9, but if it is 4, the fourth digit can only be 0-7. This pattern would continue for each of the remaining digits. Hopefully you get the idea. When you get to the final digit, its range depends not only on the nine preceding digits, but also the sign. If this is 64-bit, that adds even more wrinkles (including being aware of whether your implementation supports 64-bit ints). It may be possible to do with regular expressions, but it would definitely be complex and probably a time sink. As I said, if you KNOW you won't be dealing with integers that are more than nine digits, the regex should work fine. Remember, the OP didn't ask if it was an integer in the realm of infinite pure integers; he asked how to tell if a string was a number that could be converted to an int (presumably without loss). Andrew
Re: [PHP] variable type - conversion/checking
On Sat, 2013-03-16 at 11:46 -0400, Andrew Ballard wrote: On Mar 16, 2013 6:14 AM, Ashley Sheridan a...@ashleysheridan.co.uk wrote: On Fri, 2013-03-15 at 22:32 -0400, Andrew Ballard wrote: Guess regex are the only useful solution here. When you consider to use built-in functions, just remember, that for example '0xAF' is an integer too, but '42.00' isn't. Shoot...I hadn't considered how PHP might handle hex or octal strings when casting to int. (Again, not in front of a computer where I can test it right now. ) Regexes have problems with more than 9 digits for 32-bit ints. I guess to some degree it depends on how likely you are to experience values that large. Andrew Do they? Regex's deal with strings, so I don't see why they should have such issues. I've certainly never come across that problem, or heard of it before. Thanks, Ash http://www.ashleysheridan.co.uk Sure. If the string is nine or fewer digits, they can all be 0-9. If it is 10 digits, the first digit can only be 1-2. If it's 1, the remaining nine digits can still be 0-9, but if the first digit is 2, the second digit can only be 0-1. If the second digit is 0, the remaining eight digits can still be 0-9, but if it is 1, the third digit can only be 0-4. If the third digit is 0-3, the remaining seven digits can still be 0-9, but if it is 4, the fourth digit can only be 0-7. This pattern would continue for each of the remaining digits. Hopefully you get the idea. When you get to the final digit, its range depends not only on the nine preceding digits, but also the sign. If this is 64-bit, that adds even more wrinkles (including being aware of whether your implementation supports 64-bit ints). It may be possible to do with regular expressions, but it would definitely be complex and probably a time sink. As I said, if you KNOW you won't be dealing with integers that are more than nine digits, the regex should work fine. Remember, the OP didn't ask if it was an integer in the realm of infinite pure integers; he asked how to tell if a string was a number that could be converted to an int (presumably without loss). Andrew Ah, I see. I think that's not an issue as such with regular expressions having problems, more that bit limitations has a problem with numbers! Bearing that in mind, this does the trick: $string1 = '9'; $string2 = '99'; $string3 = '99'; var_dump($string === (intval($string1).'')); var_dump($string === (intval($string2).'')); var_dump($string === (intval($string3).'')); I'm getting the expected results on my machine (32-bit) but a 64-bit machine would get the correct results for larger numbers. Thanks, Ash http://www.ashleysheridan.co.uk
Re: [PHP] variable type - conversion/checking
Hi,
I have tried to find a way to check if a character string is possible to
test whether it is convertible to an intger !
any suggestion ?
BR georg
All responses in this thread have been very nice; but you could also try
a much simpler 2-step check:
1. is_numeric
2. if true check if there's a decimal character in the string:
if(is_numeric($str) false === strpos('.', $str)) {
// it's an int for sure
} else {
// might be a number, but it's definitly not an int
}
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Re: [PHP] variable type - conversion/checking
On Sat, Mar 16, 2013 at 6:52 PM, Maciek Sokolewicz
maciek.sokolew...@gmail.com wrote:
Hi,
I have tried to find a way to check if a character string is possible to
test whether it is convertible to an intger !
any suggestion ?
BR georg
All responses in this thread have been very nice; but you could also try a
much simpler 2-step check:
1. is_numeric
2. if true check if there's a decimal character in the string:
if(is_numeric($str) false === strpos('.', $str)) {
// it's an int for sure
} else {
// might be a number, but it's definitly not an int
}
Wrong. is_numeric will accept 1e1, which is a float, so you would need to
check for e or E too.
- Matijn
Re: [PHP] variable type - conversion/checking
On Sat, Mar 16, 2013 at 12:21 PM, Ashley Sheridan
a...@ashleysheridan.co.uk wrote:
On Sat, 2013-03-16 at 11:46 -0400, Andrew Ballard wrote:
On Mar 16, 2013 6:14 AM, Ashley Sheridan a...@ashleysheridan.co.uk wrote:
On Fri, 2013-03-15 at 22:32 -0400, Andrew Ballard wrote:
Guess regex are the only useful solution here. When you consider to use
built-in functions, just remember, that for example '0xAF' is an
integer
too, but '42.00' isn't.
Shoot...I hadn't considered how PHP might handle hex or octal strings
when
casting to int. (Again, not in front of a computer where I can test it
right now. )
Regexes have problems with more than 9 digits for 32-bit ints. I guess to
some degree it depends on how likely you are to experience values that
large.
Andrew
Do they? Regex's deal with strings, so I don't see why they should have
such issues. I've certainly never come across that problem, or heard of it
before.
Thanks,
Ash
http://www.ashleysheridan.co.uk
Sure. If the string is nine or fewer digits, they can all be 0-9. If it is
10 digits, the first digit can only be 1-2. If it's 1, the remaining nine
digits can still be 0-9, but if the first digit is 2, the second digit can
only be 0-1. If the second digit is 0, the remaining eight digits can still
be 0-9, but if it is 1, the third digit can only be 0-4. If the third digit
is 0-3, the remaining seven digits can still be 0-9, but if it is 4, the
fourth digit can only be 0-7.
This pattern would continue for each of the remaining digits. Hopefully you
get the idea. When you get to the final digit, its range depends not only
on the nine preceding digits, but also the sign. If this is 64-bit, that
adds even more wrinkles (including being aware of whether your
implementation supports 64-bit ints). It may be possible to do with regular
expressions, but it would definitely be complex and probably a time sink.
As I said, if you KNOW you won't be dealing with integers that are more
than nine digits, the regex should work fine.
Remember, the OP didn't ask if it was an integer in the realm of infinite
pure integers; he asked how to tell if a string was a number that could be
converted to an int (presumably without loss).
Andrew
Ah, I see. I think that's not an issue as such with regular expressions
having problems, more that bit limitations has a problem with numbers!
ANY computer system is going to have limitations with numbers -- you
can't store infinity in a finite system. LOL
Bearing that in mind, this does the trick:
$string1 = '9';
$string2 = '99';
$string3 = '99';
var_dump($string === (intval($string1).''));
var_dump($string === (intval($string2).''));
var_dump($string === (intval($string3).''));
That's the same thing I posted, just different syntax. You are still
converting the string to an int, converting the int back to a string,
and comparing the resulting value to the original string using the
identical (===) operator. Depending on one's needs, it could be
tweaked a little to handle leading/trailing spaces, leading zeroes,
etc.
function is_int_hiding_as_string($value)
{
if (is_string($value)) {
// remove any spaces around the value.
$value = trim($value);
// check for a sign :-)
$sign = (substr($value, 0, 1) === '-') ? '-' : '';
// strip off the sign, any additional leading spaces or zeroes
$value = ltrim($value, ' 0-');
// I didn't strip off trailing zeroes after the decimal because
// I consider that a loss of precision, but you could do so
// if necessary.
return ($value === $sign . (int)$value);
}
return false;
}
I'm getting the expected results on my machine (32-bit) but a 64-bit machine
would get the correct results for larger numbers.
As I understood the original post, these ARE the correct results on
ANY system. If the string value can be safely converted to an int *in
the environment under which the script is executing* without loss of
precision, this will return true; if it cannot, it returns false.
Sorry for getting carried away, but it is SO much easier to respond on
an actual keyboard than my phone. :-)
Andrew
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