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Bug #28986 'if' bug
Submitted: 2004-07-01 20:26 UTC Modified: 2004-07-01 20:49 UTC
From: philipp at bind dot ch Assigned:
Status: Not a bug Package: *General Issues
PHP Version: Irrelevant OS: Linux
Private report: No CVE-ID: None
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From: philipp at bind dot ch
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 [2004-07-01 20:26 UTC] philipp at bind dot ch
Description:
------------
hi there!

I'll past some code here to explain my problem.
I dont know if it is a bug or not bug it looks like one to me!

I had some real ugly problems because of this.
If you have a look at the output of this code you'll see what i mean!
if php commpares 0 with any string the if function tells us that this is true.

I cant believe that the language should be like that so I wrote this bug-report.



Reproduce code:
---------------
$test_char = 'a';
$my_array = array(0, 1, '0', '1', 'a', 'b');
for($i = 0; $i < 6; $i++)
{
        if($my_array[$i] == $test_char)
                echo("php's 'if' tells us that {$my_array[$i]} is the same as {$test_char}\n");
        else
                echo("php's 'if' tells us that {$my_array[$i]} is not the same as {$test_char}\n");
}

Expected result:
----------------
php's 'if' tells us that 0 is not the same as a
php's 'if' tells us that 1 is not the same as a
php's 'if' tells us that 0 is not the same as a
php's 'if' tells us that 1 is not the same as a
php's 'if' tells us that a is the same as a
php's 'if' tells us that b is not the same as a


Actual result:
--------------
php's 'if' tells us that 0 is the same as a
php's 'if' tells us that 1 is not the same as a
php's 'if' tells us that 0 is not the same as a
php's 'if' tells us that 1 is not the same as a
php's 'if' tells us that a is the same as a
php's 'if' tells us that b is not the same as a


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 [2004-07-01 20:49 UTC] mgf@php.net
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

This is how == works (if either side is an int, the other is also converted to int before comparison).  Use === if you want to take type into account as well as value.

(See also  http://uk.php.net/manual/en/types.comparisons.php and http://uk.php.net/manual/en/language.types.type-juggling.php)
 
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