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<?php class bar { function baz() {} static function foo() {} } function foo(callable $bar) { var_dump($bar); } $closure = function () {}; foo("strpos"); foo("foo"); foo(array("bar", "baz")); foo(array("bar", "foo")); foo($closure);
Output for git.master, git.master_jit, rfc.property-hooks
string(6) "strpos" string(3) "foo" Fatal error: Uncaught TypeError: foo(): Argument #1 ($bar) must be of type callable, array given, called in /in/8jh7W on line 14 and defined in /in/8jh7W:7 Stack trace: #0 /in/8jh7W(14): foo(Array) #1 {main} thrown in /in/8jh7W on line 7
Process exited with code 255.

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