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<?php function foo(&$bar) { var_dump($bar); } $z = new stdclass; call_user_func("foo", array($z));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: foo(): Argument #1 ($bar) must be passed by reference, value given in /in/mr3DN on line 4 array(1) { [0]=> object(stdClass)#1 (0) { } }

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