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run code in 150+ php & hhvm versions
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<?php class Test {} class_alias('Test', 'Test2'); var_dump(class_exists('Test2'));
based on HO67Z
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(true)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.17
Fatal error: Call to undefined function class_alias() in /in/XPE72 on line 5
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: class_alias() in /in/XPE72 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: class_alias() in /in/XPE72 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: class_alias() in /in/XPE72 on line 5