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@ 2014-04-25T11:06:20Z

<?php
var_dump(preg_match('/./u', "\xf8\xa1\xa1\xa1\xa1"));
var_dump(preg_match('/./u', "\xfc\xa1\xa1\xa1\xa1\xa1"));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

42.02 ms | 402 KiB | 5 Q