Write a PHP program which reads the two adjoined sides and the diagonal of a parallelogram and check whether the parallelogram is a rectangle or a rhombus

<?php
$e1 = 3; 
$e2 = 4;
$di = 5;
//$e1 = 5; 
//$e2 = 5;
//$di = 8;
$rec = 0;
$dia = 0;   
    if ($e1 * $e1 + $e2 * $e2 === $di * $di) {
        $rec++;
    }
    if ($e1 === $e2) {
        $dia++;
    } 
if ($rec>0)
echo "This is rectangles.";
if ($dia>0)
echo "This is rhombus.";
?>