ช่วยดูโค้ด ตรวจข้อสอบทีครับ อยากรู้ว่าโค้ดของผม ผิดตรงส่วนไหนครับ

$answer[0] = "C";
		$answer[1] = "D";
		$answer[2] = "A";
		$answer[3] = "B";
		$answer[4] = "D";
		$answer[5] = "B";
		$answer[6] = "B";
		$answer[7] = "D";
		$answer[8] = "A";
		$answer[9] = "A";
		$answer[10] = "B";
		$answer[11] = "C";
		$answer[12] = "B";
		$answer[13] = "B";
		$answer[14] = "A";
		$answer[15] = "D";
		$answer[16] = "B";
		$answer[17] = "D";
		$answer[18] = "B";
		$answer[19] = "D";
                $score = 0;
	$data = file("C:\AppServ\www\answer.txt");
	foreach ($data as $a)
	{
                }
	for ($i= 0 ;$i < count($answer);$i++)
	{
		if ($answer[$i] == $a[$i])
		{
			$score = $score + 1;
		}
	}