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@ 2014-06-17T12:56:24Z

<?php

$s = "efpinezf'àçhfnds__+-";
$sep = '-';
$regexp = '/[^a-z0-9-_]+/i';

$res  = preg_replace($regexp, $sep, $s);var_dump($res);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

40.76 ms | 402 KiB | 5 Q