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run code in 150+ php & hhvm versions
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<?php class B {} interface A {} var_dump(class_exists('B', false)); var_dump(class_exists('A', false));
based on 5O9Dt
Output for 5.0.2 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(true) bool(false)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.1
bool(true) bool(true)
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/A1gIj on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING in /in/A1gIj on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/A1gIj on line 5
Process exited with code 255.