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<?php class Foo { public static function fooBar() { return 'Hello World'; } } $callable = 'Foo:fooBar'; var_dump(is_callable($callable)); var_dump(call_user_func($callable));
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
bool(false) Warning: call_user_func() expects parameter 1 to be a valid callback, function 'Foo:fooBar' not found or invalid function name in /in/hC9G6 on line 13 NULL
Output for hhvm-3.10.0 - 3.12.0
bool(false) Warning: Invalid argument: function: method 'Foo:fooBar' not found in /in/hC9G6 on line 13 NULL
Output for 5.0.0 - 5.2.17
bool(false) Warning: call_user_func(Foo:fooBar): First argument is expected to be a valid callback in /in/hC9G6 on line 13 NULL
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/hC9G6 on line 4
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, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/hC9G6 on line 4
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/hC9G6 on line 4
Process exited with code 255.