Monatsarchiv für Dezember 2009


PHP: Do NOT rebuild preg_* functions!

In a PHP Project i am currently helping out, i found this function:

 * Replaces every char in $str that does is not in $valid array
 * @param array $valid
 * @param string $str
 * @return string

function cleanString($valid, $str) {
  $ret = '';
  $len = strlen($str);
  for($i = 0; $i < $len; ++$i) {
    if(in_array($str[$i], $valid, true)) {
      $ret .= $str[$i];
  return $ret;

It is a simple function for replacing chars. It works quite well, but was mainly only used for checking [^a-z0-9]. So i tested the speed of this code.

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