การบ้าน PHP


<?php $score=79;if($score<50){echo 'grade 0';}else if($score<56){echo 'grade 1';}else if($score<60){echo 'grade 1.5';}else if($score<66){echo 'grade 2';}else if($score<70){echo 'grade 2.5';}else if($score<76){echo 'grade 3';}else if($score<80){echo 'grade 3.5';}else{echo 'grade 4';}?>