my if else
<?php
$score=77;
if($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 if($score < 86){
echo 'grade 4'; 
}else if($score < 90){
?>