Someone

<html>
<body>
<?php

$sides = array();
$perimeter = 0
echo "how many sides does this figure have?";
//simulated user input
$sidenum = 5;
$i = 0;

DOWHILE "$i" <= "($sidenum - 1)"
 echo "please enter the length of side number $i";
 //simulated user input
 $side["$i"] = 5;
 $i =+ 1;
ENDDO

$i = 0;
DOWHILE "$i" <= "($sidenum - 1)"
 $perimeter == $side;
 $i =+ 1;
ENDDO

echo "the perimeter is $perimeter";
?>
</body>
</html>