Complete Code For Calculate The Area of Rectangle Using PHP.
<!DOCTYPE html> <html> <head> <title>How Can I Calculate The Area of Triangle Using PHP</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet"> </head> <style> body { background: black; } </style> <body> <body> <div class="container"> <br/><br/> <div class="text-center"> <h1 id="color" style="color: white;">Calculating The Area of Triangle Using PHP</h1> </div> <div class="well"> <form action="" method="post" > <label>Enter Width</label><br> <input type="text" name="width" value=""><br><br> <label>Enter Length</label><br> <input type="text" name="length" value=""><br><br> <input type="submit" value="submit" class="btn btn-success" name="submit"> </form> <?php if(isset($_POST['submit'])) { $width = $_POST['width']; $length = $_POST['length']; $area = $width*$length; echo "The area of a rectangle with $width x $length is $area"; } ?> </div> </div> </body> </html>