A simple burger order form in written using PHP, HTML and CSS.

 I am currently accepting programming work, IT projects, school and application development, programming projects, thesis and capstone projects, IT consulting work, computer tutorials, and web development work kindly contact me at the following email address for further details.  If you want to advertise on my website kindly contact me also in my email address also. Thank you.

My email address is the following jakerpomperada@gmail.com, jakerpomperada@aol.com, and jakerpomperada@yahoo.com.

My mobile number here in the Philippines is 09173084360.

My telephone number at home here in Bacolod City, Negros Occidental Philippines is  +63 (034) 4335675.

Here in Bacolod City I also accepting computer repair, networking, and Arduino Project development at a very affordable price. My website is www.jakerpomperada.blogspot.com and www.jakerpomperada.com

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Program Listing
index.php

<?php
    $name = $contact = $address = $size = $flavor = $extras = "";
    $vis1 = "visibility_on";
    $vis2 = "visibility_off";

    if (isset($_POST["btnCalculate"])) {
        $name    = isset($_POST['txtName'])    ? $_POST['txtName']    : "";
        $size    = isset($_POST['txtSelect'])  ? $_POST['txtSelect']  : "";
        $flavor  = isset($_POST['txtFlavor'])  ? $_POST['txtFlavor']  : "";
        $num = 0;
        foreach($_POST['txtExtras'] as $check) {
            if (++$num === count($_POST['txtExtras'])) {
                $extras .= $check;
            } else {
                $extras .= $check.", ";
            }
        }
        $vis1 = "visibility_off";
        $vis2 = "visibility_on";
    }

    
?>
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>Burger Order Form in PHP</title>
        <link rel="stylesheet" href="style.css">
    </head>
    <body>
        <main>
            <div class="container <?php echo $vis1; ?>">
                <h1>Burger Order Form in PHP</h1>
                <h2>&#187; Jake R. Pomperada, MAED-IT, MIT &#171;</h2>

                <div class="container-wrapper">
                    <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" class="frmBasicMath">
                        <input type="text" name="txtName" class="txtbox" placeholder="Full Name" required>

                        <select name="txtFlavor" class="txtbox" required>
                            <option value="" selected disabled>~ Select Flavor ~</option>
                            <option value="Regular">Regular</option>
                            <option value="American">American</option>
                            <option value="Vegetarian">Vegetarian</option>
                        </select>

                        <select name="txtSelect" class="txtbox" required>
                            <option value="" selected disabled>~ Select Size ~</option>
                            <option value="Small">Small</option>
                            <option value="Medium">Medium</option>
                            <option value="Large">Large</option>
                            <option value="Double Patty">Double Patty</option>
                            <option value="Triple Patty">Triple Patty</option>
                        </select>

                        <div class="checkboxWrapper">
                            <label class="checkbox">Extra Cheese
                                <input type="checkbox" name="txtExtras[]" value="Extra Cheese">
                                <span class="checkmark"></span>
                            </label>
                            <label class="checkbox">Extra Gravy
                                <input type="checkbox" name="txtExtras[]" value="Extra Gravy">
                                <span class="checkmark"></span>
                            </label>
                            <label class="checkbox">Extra Veggies
                                <input type="checkbox" name="txtExtras[]" value="Extra Veggies">
                                <span class="checkmark"></span>
                            </label>
                        </div>

                        <button type="submit" class="btnCalculate" name="btnCalculate">Place Order</button>
                    </form>
                </div>
            </div>
            <div class="container <?php echo $vis2; ?>">
                <h1>Burger Order Form in PHP</h1>
                <h2>&#187; Jake R. Pomperada, MAED-IT, MIT &#171;</h2>

                <table>
                    <tr><th>Full Name:</th><td><?php echo $name; ?></td></tr>
                    <tr><th>Flavor:</th><td><?php echo $flavor; ?></td></tr>
                    <tr><th>Size:</th><td><?php echo $size; ?></td></tr>
                    <tr><th>Extras:</th><td><?php echo $extras; ?></td></tr>
                </table>
                <a href="index.php" class="btnReset">New Order</a>
            </div>
        </main>
    </body>
</html>

style.css

* {
    box-sizing: border-box;
}

body {
    font-family: "Calibri", sans-serif;
    background: #e2e1e0;
    color: #111;
}

main {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
}

.container {
    padding: 40px;
    width: 480px;
    background: #fff;
    text-align: left;
    border-radius: 25px;
    white-space: normal;
}

h1 {
    margin: 0;
    line-height: 1.2;
    text-align: center;
}

h2 {
    margin: 0 0 30px;
    font-size: 22px;
    text-align: center;
}

.txtbox {
    display: inline-block;
    background: #eee;
    width: 100%;
    margin: 0 0 8px 0;
    padding: 15px;
    border: none;
    font-size: 15px;
}

.txtbox:focus {
    background: #f1f1f1;
    outline: none;
}

.btnReset,
button {
    display: block;
    background: #2196f3;
    color: #fff;
    padding: 15px;
    font-size: 15px;
    width: 100%;
    opacity: 0.9;
    outline: none;
    text-transform: uppercase;
    border: none;
    text-decoration: none;
    text-align: center;
    border: none;
}

.btnReset {
    background: #ff5722;
}

.btnReset:hover,
button:hover {
    opacity: 1;
}

.visibility_on {
    display: block;
}

.visibility_off {
    display: none;
}

.checkboxWrapper {
    margin: 0 0 10px;
    display: inline-flex;
}

.checkbox {
    display: block;
    position: relative;
    padding-left: 35px;
    margin: 0 0 8px 10px;
    cursor: pointer;
    font-size: 15px;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}
.checkbox:first-child {
    margin: 0 0 10px;
}
/* Hide the browser's default checkbox */
.checkbox input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}
/* Create a custom checkbox */
.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 25px;
    width: 25px;
    background-color: #eee;
}
/* On mouse-over, add a grey background color */
.checkbox:hover input ~ .checkmark {
    background-color: #ccc;
}
/* When the checkbox is checked, add a blue background */
.checkbox input:checked ~ .checkmark {
    background-color: #4caf50;
}
/* Create the checkmark/indicator (hidden when not checked) */
.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}
/* Show the checkmark when checked */
.checkbox input:checked ~ .checkmark:after {
    display: block;
}
/* Style the checkmark/indicator */
.checkbox .checkmark:after {
    left: 9px;
    top: 5px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 3px 3px 0;
    -webkit-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    transform: rotate(45deg);
}

table {
    margin-bottom: 10px;
    font-size: 18px;
    border: none;
    padding: 0;
    width: 100%;
}

table th {
    width: 120px;
    padding: 8px;
    background: #2196f3;
    color: #fff;
    text-align: right;
}

table td {
    padding: 8px;
    border: 2px solid #111;
}