Delete anything not alphanumeric

[schleppel]

The title says it, i would like to know how i would go about deleting anything in a string that is not a-z A-Z or 0-9.

Thank you.

[marek_mar]

I'm actualy suggesting regex...

<?
$txt ='hell!o 108 dDFfdofig';
preg_match_all('/[a-zA-Z0-9]/', $txt, $txt);
$txt = implode('', $txt[0]);
print $txt; // Output: hello108dDFfdofig
?>

[schleppel]

Thank you, that's perfect!

[hemebond]

<?php
$string = preg_replace('([^a-zA-Z0-9 ])', '', 'This is a g%^73(7634 string');
echo $string;
?>

[schleppel]

Thank you aswell.

[marek_mar]

Hoebond's version is probably better...