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<?php $value = 'O:+8:"stdClass":0:{}'; $ret = (bool)preg_match('/(^|;|{|})O:\+?[0-9]+:"/', $value); var_dump($value, $ret);
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(20) "O:+8:"stdClass":0:{}" bool(true)
preferences:
146.31 ms | 404 KiB | 181 Q