note 112903 added to function.array-diff

I was looking for a function to find the difference between 2 arrays with respect to their values as opposed to their structure. Let's say we have 2 arrays, identical in structure and I'm looking to output a 3rd array, again, identical in structure but containing the difference in the value of leaf nodes. This could be suitable for comparing 2 data blocks over different date ranges for example. function array_diff_values_percent($v1, $v2) { return (!empty($v2) && is_numeric($v1) && is_numeric($v2)) ? round(($v1-$v2)/$v2*100,2).'%' : '-'; } function array_diff_values($a1, $a2, $callback) { if(!is_array($a1) || !is_array($a2)) return array(); $diff = array(); foreach($a1 as $key=>$val) { $diff[$key] = is_array($val) ? array_diff_values($val, $a2[$key], $callback) : call_user_func_array($callback, array($val, $a2[$key])); } return $diff; } // Example $array1 = array('key1'=>array('val1'=>4, 'val2'=>5, 'val3'=>6)); $array2 = array('key1'=>array('val1'=>3, 'val2'=>4, 'val3'=>5)); print_r(array_diff_values($array1, $array2, 'array_diff_values_percent')); /* Outputs Array ( [key1] => Array ( [val1] => 33.33% [val2] => 25% [val3] => 20% ) ) */ ---- Server IP: 69.147.83.199 Probable Submitter: 86.44.204.55 ---- Manual Page -- http://php.net/manual/en/function.array-diff.php Edit -- https://master.php.net/note/edit/112903 Del: integrated -- https://master.php.net/note/delete/112903/integrated Del: useless -- https://master.php.net/note/delete/112903/useless Del: bad code -- https://master.php.net/note/delete/112903/bad+code Del: spam -- https://master.php.net/note/delete/112903/spam Del: non-english -- https://master.php.net/note/delete/112903/non-english Del: in docs -- https://master.php.net/note/delete/112903/in+docs Del: other reasons-- https://master.php.net/note/delete/112903 Reject -- https://master.php.net/note/reject/112903 Search -- https://master.php.net/manage/user-notes.php