Bug #61540 [Opn->Nab]: array_diff has problem when in second array is entry with null value

Edit report at https://bugs.php.net/bug.php?id=61540&edit=1 ID: 61540 Updated by: johannes@php.net Reported by: pfraszczak at power dot com dot pl Summary: array_diff has problem when in second array is entry with null value -Status: Open +Status: Not a bug Type: Bug Package: Arrays related Operating System: ubuntu PHP Version: 5.3.10 Block user comment: N Private report: N New Comment: Sorry, but your problem does not imply a bug in PHP itself. For a list of more appropriate places to ask for help using PHP, please visit http://www.php.net/support.php as this bug system is not the appropriate forum for asking support questions. Due to the volume of reports we can not explain in detail here why your report is not a bug. The support channels will be able to provide an explanation for you. Thank you for your interest in PHP. Previous Comments: ------------------------------------------------------------------------ [2012-03-29 04:24:54] reeze dot xia at gmail dot com Hi pfraszczak: This is NOT a bug. because "" == NULL => TRUE. if we change the test script to : $a = array('street'=>'not-null-equal-value','number'=>'n1'); $b = array('street'=>'b1','number'=>'n1','test'=>null); var_dump(array_diff($a,$b)); you will get the right result. ------------------------------------------------------------------------ [2012-03-28 10:27:18] pfraszczak at power dot com dot pl Changed package ------------------------------------------------------------------------ [2012-03-28 10:23:25] pfraszczak at power dot com dot pl Description: ------------ I notice that array_diff return empty array when in second array we have entry with null value. When i removed entry with test key - everything works fine. Moreover it seems that null values in $a array don't brake array_diff Test script: --------------- $a = array('street'=>'','number'=>'n1'); $b = array('street'=>'b1','number'=>'n1','test'=>null); var_dump(array_diff($a,$b)); Expected result: ---------------- array(1) { ["street"]=> string(0) "" } Actual result: -------------- array(0) { } ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=61540&edit=1