<?php // // testnumericrepl.php // //require_once('timer.inc.php'); $input = "001215adc054zedrft4578tyhgreds89hjpodiwnvtsrz64457125001215adc054zedrft4578tyhgreds89hjpodiwnvtsrz64457125001215adc054zedrft4578tyhgreds89hjpodiwnvtsrz64457125001215adc054zedrft4578tyhgreds89hjpodiwnvtsrz64457125001215adc054zedrft4578tyhgreds89hjpodiwnvtsrz64457125001215adc054zedrft4578tyhgreds89hjpodiwnvtsrz64457125"; echo "replacing non-numeric characters in '$input' with their alphabetic rank... "; echo '<hr>method 1 : str_replace(arrays) '; TimerStart(); $from_this = array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'); $to_this = array('1','2','3','4','5','6','7','8','9','10','11','12','13','14','15','16','17','18','19','20','21','22','23','24','25','26'); $new = str_replace($from_this, $to_this, $input); echo $new; TimerStop(TRUE); // display elapsed time echo '<hr>method 2 : for loop+Ord() '; TimerStart(); $input=strtoupper($input); $ll=strlen($input); $new=''; for ($i=0;$i<$ll;$i++) if (!is_numeric($c=$input[$i])) $new.=ord($c)-64; else $new.=$c; echo $new; TimerStop(TRUE); ?>