rayne php

<?php

function grading() {
    $accumulator = 0;
    for ($i = 0; $i < 7; $i++) {
        $input = getValidGrade($i + 1);
        $accumulator += $input;
    }

    $average = $accumulator / 7;
    echo "Average Grade: " . round($average, 2) . "\n";

    if ($average >= 98 && $average <= 100) {
        echo "With Highest Honor\n";
    } elseif ($average >= 95 && $average < 98) {
        echo "With High Honors\n";
    } elseif ($average >= 90 && $average < 95) {
        echo "With Honors\n";
    } elseif ($average >= 75 && $average < 90) {
        echo "Passed\n";
    } elseif ($average >= 51 && $average < 75) {
        echo "Failed\n";
    }

    echo "Continue? (Y/N)\n";
}

function getValidGrade($subjectNumber) {
    while (true) {
        echo "Enter grade for Subject $subjectNumber: ";
        $input = readline();
        if (is_numeric($input) && $input >= 0 && $input <= 100) {
            return (float)$input;
        } else {
            echo "Enter a valid number between 0 and 100!\n";
        }
    }
}
grading();
while (true) {

    $input = readline();
    switch (strtolower($input)) {
        case 'no':
        case 'n':
            break 2;
        case 'yes':
        case 'y':
            grading();
            break;
        default:
            echo "Please respond with YES, Yes, yes or NO, No, no (or Y, y or N, n)\n";
            break;
    }
}

?>