Bug #14990 Updated: array_merge_recursive modifies inputted value

ID: 14990 Updated by: andrei@php.net Reported By: philip@cornado.com -Status: Open +Status: Closed Bug Type: Arrays related Operating System: n/a PHP Version: 4.1.1 New Comment: This bug has been fixed in CVS. Previous Comments: ------------------------------------------------------------------------ [2002-01-11 04:32:53] philip@cornado.com With 3+ parameters, only the first parameter is left untouched. All others are affected, as demonstrated above with $b. ------------------------------------------------------------------------ [2002-01-11 04:02:21] philip@cornado.com In Summary: -------------- array_merge_recursive() modifies the array entered as the second parameter if the merged arrays have at least one identical stringed key. It will affect all such duplicate keys, and modify the second parameter's array as demonstrated below. Example: -------------- <?php $a = array(2 => '2 a', 'foo' => 'foo a','bar' => 'bar a'); $b = array(2 => '2 b', 'foo' => 'foo b','bar' => 'bar b'); $c['recursive'] = array_merge_recursive($a,$b); $c['a'] = $a; $c['b'] = $b; print_r($c); ?> Example output: --------------- Array ( [recursive] => Array ( [0] => 2 a [foo] => Array ( [0] => foo a [1] => foo b ) [bar] => Array ( [0] => bar a [1] => bar b ) [1] => 2 b ) [a] => Array ( [2] => 2 a [foo] => foo a [bar] => bar a ) [b] => Array ( [2] => 2 b [foo] => Array ( [0] => foo b ) [bar] => Array ( [0] => bar b ) ) ) Notes: ---------------- Notice how in $b, keys 'foo' and 'bar' are now arrays when initially they were not. This behavior exists with all such duplicate stringed keys. array_merge_recursive() should not directly affect inputted values. This seems related to bug #14128. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=14990&edit=1