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@ 2015-11-16T15:09:52Z

<?php

$value = 'O:+8:"stdClass":0:{}';
$ret = (bool)preg_match('/(^|;|{|})O:\+?[0-9]+:"/', $value);

var_dump($value, $ret);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

28.62 ms | 402 KiB | 5 Q