<?php $find = array( "0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f" ); $replace = array( "a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p" ); $find = array_flip($find); echo preg_replace_callback('/[a-f0-9]/', function ($v) use($replace, $find) { return $replace[$find[$v[0]]]; }, $haystack); ?>
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