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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);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ArgumentCountError: array_map() expects at least 2 arguments, 1 given in /in/mjCEp:13 Stack trace: #0 /in/mjCEp(13): array_map('is_callable') #1 {main} thrown in /in/mjCEp on line 13
Process exited with code 255.

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