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<?php function foo(array &$foo) { $foo[] = 2; } $a = array(1); call_user_func('foo', $a); var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: foo(): Argument #1 ($foo) must be passed by reference, value given in /in/T5Z25 on line 9 array(1) { [0]=> int(1) }

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