Rewrite following PHP code using associative array(s) inside of a loop:

$students = array("Alex", "Mary", "Cole");

$grades = array("50", "70", "90");

echo $students[0]." got". $grades[0]. " from the exam.
";

echo $students[1]." got". $grades[1]. " from the exam.
";

echo $students[2]." got". $grades[2]. " from the exam.
";

?>