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run code in 150+ php & hhvm versions
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<?php namespace CSBill\UserBundle\Entity { class User { } } namespace { $name = 'CSBill\UserBundle\Entity\User'; $string = sprintf('O:%d:"%s":0:{}', strlen($name), $name); var_dump(unserialize($string)); }
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(CSBill\UserBundle\Entity\User)#1 (0) { }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_STRING in /in/hXs9H on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/hXs9H on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/hXs9H on line 3
Process exited with code 255.