note 103396 added to function.array-merge-recursive

There is one problem in bersace03's function: if the key value is an empty array, the key/value will be gone after merging. e.g. Array A: array( 'a' => 123, 'b' => array() ) Array B: array( 'a' => 456 ); Expected result: array( 'a' => 456, 'b' => array() ) Actual result: array( 'a' => 456 ) A quick fix is to add $result[$key] = array(); The amended function becomes: function array_merge_recursive_unique() { $arrays = func_get_args(); $remains = $arrays; // We walk through each arrays and put value in the results (without // considering previous value). $result = array(); // loop available array foreach ( $arrays as $array ) { // The first remaining array is $array. We are processing it. So // we remove it from remaing arrays. array_shift( $remains ); // We don't care non array param, like array_merge since PHP 5.0. if ( is_array($array) ) { // Loop values foreach ( $array as $key => $value ) { if ( is_array($value) ) { // We gather all remaining arrays that have such key available $args = array(); foreach ( $remains as $remain ) { if ( array_key_exists($key, $remain) ) { array_push( $args, $remain[$key] ); } } $result[$key] = array(); if ( count($args) > 2 ) { // Put the recursion $result[$key] = call_user_func_array( __FUNCTION__, $args ); } else { foreach ( $value as $vkey => $vval ) { $result[$key][$vkey] = $vval; } } } else { // Simply put the value $result[$key] = $value; } } } } return $result; } ---- Server IP: 59.188.18.107 Probable Submitter: 118.142.92.126 ---- Manual Page -- http://www.php.net/manual/en/function.array-merge-recursive.php Edit -- https://master.php.net/note/edit/103396 Del: integrated -- https://master.php.net/note/delete/103396/integrated Del: useless -- https://master.php.net/note/delete/103396/useless Del: bad code -- https://master.php.net/note/delete/103396/bad+code Del: spam -- https://master.php.net/note/delete/103396/spam Del: non-english -- https://master.php.net/note/delete/103396/non-english Del: in docs -- https://master.php.net/note/delete/103396/in+docs Del: other reasons-- https://master.php.net/note/delete/103396 Reject -- https://master.php.net/note/reject/103396 Search -- https://master.php.net/manage/user-notes.php