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<?php $foo = function($var1, $var2) { var_dump($var1, $var2); }; call_user_func('foo', ['bar', 'baz']);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, function "foo" not found or invalid function name in /in/8qqPT:7 Stack trace: #0 {main} thrown in /in/8qqPT on line 7
Process exited with code 255.

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