Online PHP editor | refs for pSaid

<?php //Our recursive function. function recursive($str, $count, $start, &$duplicate){ //Print out the number. if($count > $start) { if(!isset($duplicate[$str[$start]])) { $duplicate[$str[$start]] = 1; return recursive($str, $count, $start+1, $duplicate); } else { //array_push($duplicate, array($start=>$str[$start])); $duplicate[$str[$start]] +=1; return recursive($str, $count, $start+1, $duplicate); } } } //Set our start number to 1. $str = 'buffet'; $count = strlen($str); $start = 0; $duplicate = array(); //Call our recursive function. recursive($str, $count, $start, $duplicate); print_r($duplicate);