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<?php class Increment { function __invoke($x) { ++$x->num; } } $c = new Increment(); $a = new \stdClass(); $a->num = 5; call_user_func_array([$c], [$a]); var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, array callback must have exactly two members in /in/aAVqo:15 Stack trace: #0 {main} thrown in /in/aAVqo on line 15
Process exited with code 255.

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