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run code in 150+ php & hhvm versions
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<?php class X { const Y = 1; } function foo($x = X::Y) {} var_dump((new ReflectionParameter('foo', 'x'))->isDefaultValueConstant());
Output for 5.4.6 - 5.6.28, 7.0.0 - 7.1.0
bool(true)
Output for 5.4.0 - 5.4.5, hhvm-3.12.0
Fatal error: Call to undefined method ReflectionParameter::isDefaultValueConstant() in /in/5XtTB on line 5
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/5XtTB on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_OBJECT_OPERATOR in /in/5XtTB on line 5
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/5XtTB on line 3
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/5XtTB on line 3
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/5XtTB on line 3
Process exited with code 255.