What are some common methods to make form fields mandatory in PHP?

To make form fields mandatory in PHP, you can use JavaScript validation on the client-side and PHP validation on the server-side. This ensures that the required fields are filled out before the form is submitted. You can also use HTML5 attributes like "required" to make fields mandatory on the client-side. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    $email = $_POST["email"];
    
    if (empty($name) || empty($email)) {
        echo "Name and email are mandatory fields.";
    } else {
        // Process the form data
    }
}
?>

Keywords

PHP form validation required fields isset function error messages

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