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<?php
function sum($arr, $n) {
    static $staticSum = 0;

    if ($n == 0) {
        $theSum = $staticSum;
        return $theSum;
    }
    $n--;
    $staticSum += $arr[$n];

    sum($arr, $n);
}



$var= array();
$var = [1, 2, 3, 4, 56];

$sum = sum($var, 5);
//var_dump($sum);