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Bug #75329 in_array is REALLY not working
Submitted: 2017-10-06 17:45 UTC Modified: 2017-10-06 17:51 UTC
From: dutr4 at outlook dot com Assigned:
Status: Not a bug Package: *General Issues
PHP Version: Irrelevant OS: Windows/Linux
Private report: No CVE-ID: None
View Developer Edit
 [2017-10-06 17:45 UTC] dutr4 at outlook dot com 
Description:
------------
http://sandbox.onlinephpfunctions.com/code/661cc810693c8da8b987f4ca8ed9272375ab1e92

for eg

<?php
    $a = array('00', '000', 0);
    $ka = 'KA';
    var_dump(
        in_array($ka, $a)
    );

will always return true in ANY version of PHP, please, this error is probably breaking a lot of systems and sites!

Test script:
---------------
<?php
    $a = array('00', '000', 0);
    $ka = 'KA';
    var_dump(
        in_array($ka, $a)
    );


Expected result:
----------------
false

Actual result:
--------------
true

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 [2017-10-06 17:48 UTC] peehaa@php.net
-Status: Open +Status: Not a bug
 [2017-10-06 17:48 UTC] peehaa@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

Without the 3rd param it will cast data. So it REALLY works as expected :-)
 [2017-10-06 17:50 UTC] peehaa@php.net 
Check out what happens on 3v4l: https://3v4l.org/Ahkcs
 [2017-10-06 17:51 UTC] pollita@php.net 
Congratulations, you have discovered weak type comparison.
This has been a feature of the language since day one, and as you say behaves consistently across all PHP versions.
If you're looking for a strict compare, please refer to third third paramter to http://php.net/in_array
 
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