Bug #54288 [Com]: array_unshift and multidimension arrays bug

Edit report at http://bugs.php.net/bug.php?id=54288&edit=1 ID: 54288 Comment by: piotrekkr at piotrekkr dot info Reported by: piotrekkr at piotrekkr dot info Summary: array_unshift and multidimension arrays bug Status: Bogus Type: Bug Package: Arrays related Operating System: Ubuntu 10.10 PHP Version: 5.3SVN-2011-03-17 (SVN) Block user comment: N Private report: N New Comment: I know that if param passed by reference does not exists it is treated as null. But the problem is: why aray_unshift() treats not existing index $arr[4] as $arr? Why it appends null at the end of $arr ? Previous Comments: ------------------------------------------------------------------------ [2011-03-17 10:18:53] scottmac@php.net This isn't related to array_unshift, it happens to any function which takes a parameter by reference. When you pass in a non existent value as a reference PHP sets it to NULL. Else you'd have nothing to work with. <?php function my_func(&$test) { return false; } $arr = array( array('ddddd'), array('eeee'), array('ffff'), array('gggg'), ); my_func($arr[4]); print_r($arr); ------------------------------------------------------------------------ [2011-03-17 10:10:44] piotrekkr at piotrekkr dot info Description: ------------ When using array_unshift() on multidimension arrays there is a bug when index in array does not exists. When you have array with arrays inside like this: $arr = array( array('ddddd'), array('eeee'), array('ffff'), array('gggg'), ); and you use: array_unshift($arr[4], 4); this function not only show you warning message, but also add one element with null value to the end (!) of $arr array. It should not be working like that. It should show a warning and do nothing. My version of PHP: piotrekkr@piotrekkr-desktop:/var/www$ php -v PHP 5.3.3-1ubuntu9.3 with Suhosin-Patch (cli) (built: Jan 12 2011 16:07:38) Copyright (c) 1997-2009 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies OS: Ubuntu 10.10 Test script: --------------- <?php $arr = array( array('ddddd'), array('eeee'), array('ffff'), array('gggg'), ); array_unshift($arr[4], 4); print_r($arr); Expected result: ---------------- PHP Warning: array_unshift() expects parameter 1 to be array, null given in /var/www/unshift_test.php on line 9 Array ( [0] => Array ( [0] => ddddd ) [1] => Array ( [0] => eeee ) [2] => Array ( [0] => ffff ) [3] => Array ( [0] => gggg ) ) Actual result: -------------- PHP Warning: array_unshift() expects parameter 1 to be array, null given in /var/www/unshift_test.php on line 9 Array ( [0] => Array ( [0] => ddddd ) [1] => Array ( [0] => eeee ) [2] => Array ( [0] => ffff ) [3] => Array ( [0] => gggg ) [4] => ) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=54288&edit=1