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Language/Type: PHP array mystery arrays

What are the values of the elements in array $a1 after the following code executes? Note that in PHP, a function parameter defined with "&" prepended to it is passed by reference, and will be changed as a result of any modification within the function.

function array_mystery4(&$a1, &$a2) {
    for ($i = 0; $i < count($a1); $i++) {
        $a1[$i] += $a2[count($a2) - $i - 1];
$a1 = [1, 3, 5, 7, 9];
$a2 = [1, 4, 9, 16, 25];
array_mystery4($a1, $a2);           

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