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<?php trait Stuff { function __invoke() { return 'I am ' . get_class($this) . '.'; } } class Thing { function __invoke() { return 'I am Thing.'; } } class Thang { use Stuff; } $things[] = function () { return 'I am Thong.'; }; $things[] = new Thing; $things[] = new Thang; $things[] = 'strlen'; $things[] = [$things[0], '__invoke']; $things[] = [$things[1], '__invoke']; var_dump(array_map('is_callable', $things)); var_dump(array_map(function ($thing) { return is_object($thing) && method_exists($thing, '__invoke'); }, $things)); var_dump(array_map(function ($thing) { return is_callable($thing, '__invoke') && !is_string($thing); }, $things));
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0, 7.1.6 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(6) { [0]=> bool(true) [1]=> bool(true) [2]=> bool(true) [3]=> bool(true) [4]=> bool(true) [5]=> bool(true) } array(6) { [0]=> bool(true) [1]=> bool(true) [2]=> bool(true) [3]=> bool(false) [4]=> bool(false) [5]=> bool(false) } array(6) { [0]=> bool(true) [1]=> bool(true) [2]=> bool(true) [3]=> bool(false) [4]=> bool(true) [5]=> bool(true) }
Output for 7.1.5

Process exited with code 137.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_STRING in /in/LZfom on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/LZfom on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/LZfom on line 3
Process exited with code 255.
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186.81 ms | 401 KiB | 356 Q