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<?php function test(&$v) { $v = $v + $v; } $v = 8; call_user_func_array('test', array($v)); echo $v;
Output for git.master, git.master_jit, rfc.property-hooks
Warning: test(): Argument #1 ($v) must be passed by reference, value given in /in/APQQg on line 9 8

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