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<?php class Foo{ public static function Bar(){ echo 'Bar'; } } function sillyboy(){ echo 'sillyboy'; } function inc(&$p1){ $p1++; } $f = 'Foo::Bar'; $f2 = 'sillyboy'; if (is_callable($f)){ call_user_func($f); } if (is_callable($f2)){ call_user_func($f2); } $num = 3; call_user_func('inc', $num); echo $num;
Output for 5.3.0 - 7.1.7
Barsillyboy Warning: Parameter 1 to inc() expected to be a reference, value given in /in/9770a on line 31 3
Output for 5.2.2 - 5.2.17
Barsillyboy3
Output for 5.1.0 - 5.2.1
Warning: call_user_func(Foo::Bar): Unable to call Foo::Bar() in /in/9770a on line 23 sillyboy3
Output for 5.0.0 - 5.0.5
sillyboy3
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/9770a 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/9770a 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/9770a on line 4
Process exited with code 255.