Calculating sum of squares in PHP [closed]

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Write a program that accepts an integer larger than 1 and calculates the sum of the squares from 1 to that integer. For example, if the integer equals 4, the sum of the squares is 30 (1 + 4 + 9 + 16, noti开发者_如何学运维ce 4 numbers)

Help plz

---

$number = intval( $_GET["number"] );
$sum = 0;

for ( $i = 1; $i <= $number; $i++ ) {
    $sum += $i * $i;
}

echo $sum;

Here is the html:

<form action="mypage.php" method="GET">
   <input type="text" name="number" />
   <input type="submit" />
</form>