Bug #54143 [Nab]: array_merge returns NULL if a parameter is NULL

Edit report at https://bugs.php.net/bug.php?id=54143&edit=1 ID: 54143 Updated by: aharvey@php.net Reported by: mchotai at fulcrum dot ca Summary: array_merge returns NULL if a parameter is NULL Status: Not a bug Type: Bug Package: Arrays related Operating System: Ubuntu 9.3 PHP Version: 5.3SVN-2011-03-02 (SVN) Block user comment: N Private report: N New Comment: Internal functions return null if invalid parameters are provided. That's expected behaviour. Previous Comments: ------------------------------------------------------------------------ [2014-06-16 18:57:04] don at smugmug dot com This is at least a bug in the documentation, where it states it'll always return an array: http://us1.php.net/array_merge But more likely is a problem in code, since it should probably always return an array like the docs suggest. Please fix one way or the other. ------------------------------------------------------------------------ [2011-03-02 23:17:05] dtajchreber@php.net It also gives you a warning explaining that parameter 1 isn't an array. If you want your output, cast NULL to an array: var_dump(array_merge((array)NULL, array('a', 'b'))); array(2) { [0]=> string(1) "a" [1]=> string(1) "b" } ------------------------------------------------------------------------ [2011-03-02 22:44:19] mchotai at fulcrum dot ca Description: ------------ $userdata = array_merge($user, $userdata); If $user is NULL the result is NULL instead of $userdata. Test script: --------------- $userdata = array("Hi", "Jim"); $userdata = array_merge(NULL, $userdata); Expected result: ---------------- Get back $userdata = array("Hi", "Jim") Actual result: -------------- NULL ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=54143&edit=1