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run code in 300+ PHP versions simultaneously
<?php function _unserialize($val) { if($result = ($val == serialize(false)) || ($result = @unserialize($val) == true)) { return $result; } return false; } var_dump(_unserialize('s:6:"foobar";')); var_dump(_unserialize('foobar')); var_dump(_unserialize('b:0;')); var_dump(serialize(false));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 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
bool(true) bool(false) bool(true) string(4) "b:0;"

preferences:
261.56 ms | 405 KiB | 338 Q