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@ 2014-04-09T09:36:30Z

<?php
$text = "234pLdfvw";
$text = preg_replace('~[^pLdw]+~u', '-', $text);
 $text = iconv('utf-8', 'us-ascii//TRANSLIT', $text);
$text = strtolower($text);

  // remove unwanted characters
  $text = preg_replace('~[^-w]+~', '', $text);

  if (empty($text))
  {
    echo 'n-a';
  }
echo $text;

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)
strtolower: documentation ( source)

preferences:dark modelive preview

35.21 ms | 402 KiB | 5 Q