note 73321 deleted from ref.array by felipe

Note Submitter: christian at enovo dot dk 

----

function array_flatten(&$a,$pref='',$sep='_') {
        $ret=array();
        foreach ($a as $i => $j)
        {
            if (is_array($j)) {
                $ret=array_merge($ret, array_flatten($j, $pref . ( strlen($pref) != 0 ? $sep : '' ) . $i ) );
            }
            else
            {
                $ret[$pref. $sep . $i] = $j;
            }
        }
        return $ret;
    }