คิดเกรด :#

<?php
$score = -1;
echo "score: ";
if($score>79)
{
echo "A";
}
elseif ($score>74)
{
echo "B+";
}
elseif ($score>69) {
echo "B";
}
elseif ($score>64) {
echo "C+";
}
elseif ($score>59) {
echo "C";
}
elseif ($score>54) {
echo "D+";
}
elseif ($score>49) {
echo "D";
}
elseif ($score>0)
{
echo "E";
}
else
{
echo "<font color='#E74C3C'>Invalid</font>";
}
 ?>