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run code in 150+ php & hhvm versions
Bugs & Features
<?php function lalala($a, callable $b) { var_dump(call_user_func($b, $a)); } $closure = function($param) { return 'something: '. $param; }; lalala('text', $closure);
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(15) "something: text"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
Catchable fatal error: Argument 2 passed to lalala() must be an instance of callable, instance of Closure given, called in /in/QlHJs on line 10 and defined in /in/QlHJs on line 3
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/QlHJs on line 8
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/QlHJs on line 8
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '&' or T_VARIABLE or T_CONST in /in/QlHJs 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_STRING, expecting '&' or T_VARIABLE or T_CONST in /in/QlHJs on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'&'' or `T_VARIABLE' or `T_CONST' in /in/QlHJs on line 3
Process exited with code 255.