Barry2014

<?php $xb = 4; //width $yb = 2; //length function rectangle($x, $y) { $a = $x * $y; return $a; } ?> <br/> Please enter the values of the length and width of your rectangle. <br/><br/> <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> Width: <input type="text" name="" id="" value="2"> <br/><br/> Length: <input type="text" name="" id="" value="4"> <br/><br/> <input type="submit" name="submit" value="submit"> </form> <?php echo $rectangle; ?> I need to output the answer 8 when a user click on submit

Ok thanks.

Thanks, I use open brackets to start the string and it still work but what is best practice. You - echo "$x+$y = " . ($x+$y); // Output me - echo ("$x+$y = " . ($x+$y)); // Output

<?PHP $x="10"; //Variable $y="7"; //Variable echo("$x+$y = 17") // Output ?> How do I get the correct answer to output without putting it in myself like how I did?