YA: Grades For Points Input

<?php
/*
            Yahoo Answers Question: http://answers.yahoo.com/question/index?qid=20110908211514AASeDoS
*/

$numOfSubjects = 5;
$grades = Array('A' => 50, 'B' => 25, 'C' => 15);

if($_SERVER['REQUEST_METHOD'] === 'POST'){
    $points = 0;
    for($i=1;$i<=$numOfSubjects;++$i){
        $points += (int)$_POST[('subject' . $i)];
    }
    echo 'You have ' . $points . ' points.';
}else{
    $dropDowns = '';
    $options = '';
    foreach($grades as $l=>$v){
        $options .= '<option value="' . $v . '">' . $l . '</option>' . PHP_EOL;
    }
    for($i=1;$i<=$numOfSubjects;++$i){
        $dropDowns .= 'Subject ' . $i . ': <select name="subject' . $i . '">' . PHP_EOL . $options . '</select><br>' . PHP_EOL;
    }
    echo 'Please input your grades:<br>' . PHP_EOL . '<form method="post">' . PHP_EOL . $dropDowns . '<input type="submit" value="Calc">' . PHP_EOL . '</form>';
}
?>