Sample Form Post in PHP

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
    <form action="index.php" method="POST">
        <input name="first_name" type="text" placeholder = 'First Name'>
        <br><br>
        <input name="middle_name" type="text" placeholder = 'Middle Name'>
        <br><br>
        <input name="last_name" type="text" placeholder = 'Last Name'>
        <br><br>
        <input name="number" type="text" placeholder = 'Contact Number'>
        <br><br>
        <input type="submit" value="Register User">
        <br><br>
    </form>
</body>
<?php
    $user = [];

    // Name will be the reference of $_POST from html form

    // Long method If
    if (isset($_POST['first_name']) && !empty($_POST['first_name'])) {
        $user['first_name'] = $_POST['first_name'];
    }
    if (isset($_POST['middle_name']) && !empty($_POST['middle_name'])) {
        $user['middle_name'] = $_POST['middle_name'];
    }
    if (isset($_POST['last_name']) && !empty($_POST['last_name'])) {
        $user['last_name'] = $_POST['last_name'];
    }
    if (isset($_POST['number']) && !empty($_POST['number'])) {
        $user['number'] = $_POST['number'];
    }

    var_dump('first example', $user);


    // Shorthand If and Else
    $register = [
        'first_name'  => (isset($_POST['first_name'])) ? $_POST['first_name'] : 'None',
        'middle_name' => (isset($_POST['middle_name'])) ? $_POST['middle_name'] : 'None',
        'last_name'   => (isset($_POST['last_name'])) ? $_POST['last_name'] : 'None',
        'number' => (isset($_POST['number'])) ? $_POST['number'] : 'None'
    ];

    var_dump('second example', $register);

?>
</html>