Bug #76505 [Ver]: array_merge_recursive() is duplicating sub-array keys

Edit report at https://bugs.php.net/bug.php?id=76505&edit=1 ID: 76505 Updated by: cmb@php.net Reported by: german dot drulyk at gmail dot com Summary: array_merge_recursive() is duplicating sub-array keys Status: Verified Type: Bug Package: Arrays related Operating System: https://3v4l.org/ PHP Version: 7.2.6 Block user comment: N Private report: N New Comment: > But shouldn't the expected result have 64=>300 and not 99=>300? The docs say[1]: | If, however, the arrays have the same numeric key, the later | value will not overwrite the original value, but will be appended. [1] <http://php.net/manual/en/function.array-merge-recursive.php> Previous Comments: ------------------------------------------------------------------------ [2018-06-20 14:21:10] requinix@php.net > But shouldn't the expected result have 64=>300 and not 99=>300? Actually no. The docs aren't exactly clear on this but I believe it's intended behavior that values in the second array having numeric keys are appended rather than created using the same key. ------------------------------------------------------------------------ [2018-06-20 14:16:52] requinix@php.net https://3v4l.org/6ivO9 Bizarre. But shouldn't the expected result have 64=>300 and not 99=>300? ------------------------------------------------------------------------ [2018-06-20 13:30:48] german dot drulyk at gmail dot com PHP 4.x and 5.x produce the expected result but PHP 7.x does not. ------------------------------------------------------------------------ [2018-06-20 13:29:36] german dot drulyk at gmail dot com Description: ------------ Keys are duplicated in the sub-array. Test script: --------------- <?php $array1 = array( 'k' => array( 2 => 100, 98 => 200, ) ); $array2 = array( 'k' => array( 64 => 300 ) ); $array3 = array_merge_recursive( $array1, $array2 ); echo '<pre>'; var_dump( $array3 ); echo 'count: '.count( $array3['k'] ); Expected result: ---------------- array(1) { ["k"]=> array(3) { [2]=> int(100) [98]=> int(200) [99]=> int(300) } } count: 3 Actual result: -------------- array(1) { ["k"]=> array(3) { [2]=> int(100) [98]=> int(200) [2]=> int(300) } } count: 3 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=76505&edit=1