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<?php class C { static function s(&$x) { $x = 2; } } $v = "C::s"; $x = 1; call_user_func($v, $x); echo $x;
Output for git.master, git.master_jit, rfc.property-hooks
Warning: C::s(): Argument #1 ($x) must be passed by reference, value given in /in/PbM0Z on line 7 1

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