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<?php function callFunc1(Closure $closure) { $closure(); } function callFunc2(Callable $callback) { $callback(); } $function = function() { echo 'Hello, World!'; }; callFunc1($function); // Hello, World! callFunc2($function); // Hello, World!
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.28, 7.4.0 - 7.4.21, 8.0.0 - 8.0.8
Hello, World!Hello, World!
Output for 5.3.0 - 5.3.29
Hello, World! Catchable fatal error: Argument 1 passed to callFunc2() must be an instance of Callable, instance of Closure given, called in /in/kqeYD on line 16 and defined in /in/kqeYD on line 7
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/kqeYD on line 11
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/kqeYD on line 11
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/kqeYD on line 3
Process exited with code 255.
Output for 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting ')' in /in/kqeYD on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/kqeYD on line 3
Process exited with code 255.

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