echo "Test #{$index}: {determineGrade($grades[$index])}.n";

for($index = 1; $index <= 5; $index++)
        {
            echo "Enter Test Score  #{$index}:";
            $grades[$index] = trim(intval(fgets(STDIN)));
        }
    echo "nn ==== Results: =====n";

    for($index =1; $index <= 5; $index++)
    {
        echo "Test #{$index}: {determineGrade($grades[$index])}.n";
    }

    $average = calcAverage($grades);

    function calcAverage($gradesArray)
    {
        // initialize a variable to hold the sum, calculated in loop
        $sumTotal = 0;
        // start this loop at $index=1 for consistency. Sum the grades.
        for($index=1; $index <= count($gradesArray); $index++)
        {
            $sumTotal = $sumTotal +  $gradesArray[$index];
        }

        return $sumTotal / 5;
    }

    function determineGrade($gradeToDetermine)
    {
        if($gradeToDetermine >= 90)
        {
            return "A";
        } else if($gradeToDetermine >= 80)
     {
                return "B";
           }
    }
    ?>