<?php
$score=79;
if ($score<50){
echo 'grade0';
}else if($score<56){
echo 'grade1';
}else if($score<60){
echo 'grade1.5';
}else if($score<66){
echo 'grade2';
}else if($score<70){
echo 'grade2.5';
}else if($score<75){
echo 'grade3';
}else if($socre<80){
echo 'grade3.5';
}else {
echo 'grade4';
}
?>
