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<?php function increment(&$v) { $v++; } $v = 1; $func = 'increment'; // Generates warning. call_user_func('increment', $v); var_dump($v); // Increments! $func($v); var_dump($v);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: increment(): Argument #1 ($v) must be passed by reference, value given in /in/1rr9P on line 11 int(1) int(2)

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