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run code in 300+ PHP versions simultaneously
<?php class a { } $d = 'O:1:"a":0:{}'; var_dump(unserialize($d, array('allowed_classs' => 'a') ));
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
object(a)#1 (0) { }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Warning: unserialize() expects exactly 1 parameter, 2 given in /in/DnLKp on line 10 bool(false)

preferences:
167.39 ms | 401 KiB | 221 Q