Giving my function access to outside variable

Question

I have an array outside:

$myArr = array();

I would like to give my function access to the array outside it so it can add values to it

Answer 1

$myArr = array();

function someFuntion(array $myArr) {
    $myVal = //some processing here to determine value of $myVal
    $myArr[] = $myVal;

    return $myArr;
}

$myArr = someFunction($myArr);