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run code in 150+ php & hhvm versions
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<?php var_dump(@strval(new stdClass));
Output for 5.2.0 - 7.1.0

Process exited with code 255.
Output for 5.0.0 - 5.1.6
string(12) "Object id #1"
Output for 4.3.0 - 4.4.9
string(6) "Object"