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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));

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