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<?php function a(int &$v){ call_user_func_array('b',func_get_args()); } function b(int &$v){ $v=9; } $v=0; a($v); var_dump($v);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: b(): Argument #1 ($v) must be passed by reference, value given in /in/4IhEq on line 3 int(0)

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