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<?php class H { static public function ensure(&$a, $k, $v){ if (!array_key_exists($k, $a)) $a[$k] = $v; } } $array = array(); H::ensure($array, 'foo', 'bar'); var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { ["foo"]=> string(3) "bar" }

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