3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $classStr = 'O:1:"a":0:{}'; var_dump(unserialize($classStr));
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(__PHP_Incomplete_Class)#1 (1) { ["__PHP_Incomplete_Class_Name"]=> string(1) "a" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.4.9
object(__PHP_Incomplete_Class)(1) { ["__PHP_Incomplete_Class_Name"]=> string(1) "a" }