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run code in 150+ php & hhvm versions
Bugs & Features
<?php class BaseFunClass { const FIRST = 'first'; } class FunClass extends BaseFunClass { const SECOND = 'second'; } $class = 'FunClass'; $constantOne = 'FIRST'; $constantTwo = 'SECOND'; var_dump(constant("$class::$constantOne")); // Returns value! var_dump(constant("$class::$constantTwo")); // Says constant is not defined
Output for 5.0.0 - 5.0.5, 5.1.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(5) "first" string(6) "second"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/MS4hG on line 18
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/MS4hG 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_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/MS4hG on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/MS4hG on line 5
Process exited with code 255.