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<?php function func(&$arraykey) { return $arraykey; // function returns by value! } $array = array('a', 'b', 'c'); foreach (array_keys($array) as $key) { $y = &func($array[$key]); $z[] =& $y; } var_dump($z);
Output for git.master, git.master_jit, rfc.property-hooks
Notice: Only variables should be assigned by reference in /in/XnVHZ on line 8 Notice: Only variables should be assigned by reference in /in/XnVHZ on line 8 Notice: Only variables should be assigned by reference in /in/XnVHZ on line 8 array(3) { [0]=> &string(1) "c" [1]=> &string(1) "c" [2]=> &string(1) "c" }

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