Online PHP editor | output for RMh5U

<?php function subtract(&$arr,$selectedDeletedNumbers){ // pass by reference to edit the same copy of the array foreach($arr as $index => $val){ $low = 0;$high = count($selectedDeletedNumbers) - 1; $equal_found = false; while($low <= $high){ $mid = intval(($low + $high) / 2); if($selectedDeletedNumbers[$mid] > $val){ $high = $mid - 1; }else if($selectedDeletedNumbers[$mid] < $val){ $low = $mid + 1; }else{ $equal_found = true; unset($arr[$index]); // if equal value, delete it as it your need break; } } if(!$equal_found){ $arr[$index] -= $low; // delete the offset till where it is greater among your $selectedDeletedNumbers } } } $selectedDeletedNumbers = [3,5]; sort($selectedDeletedNumbers); // sort to be apply binary search later $arr = [[0, 3, 10, 5, 6, 9, 2, 7, 1, 4, 8, 11], [0, 1], [0, 1], [0, 1]]; foreach($arr as &$val){ // pass by reference to edit the same copy of the array subtract($val,$selectedDeletedNumbers); } print_r($arr);