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@ 2014-10-31T14:48:50Z

<?php

$a = 'Fri Oct 25 2013 12:04:10 GMT+0100 (GMT Daylight Time)';
$if_modified_since = preg_replace('/;.*$/', '', $a);
echo strtotime($if_modified_since);

Output
Performance
VLD
References
Branches

strtotime: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

30.56 ms | 402 KiB | 5 Q