How can developers ensure a consistent user experience with form submission in PHP applications?

Developers can ensure a consistent user experience with form submission in PHP applications by validating form inputs on the server-side before processing them. This helps prevent errors and ensures that the data submitted by users meets the required criteria. By implementing proper validation techniques, developers can provide meaningful error messages to users and guide them towards submitting accurate and complete information.

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Validate form inputs
    $name = $_POST["name"];
    $email = $_POST["email"];

    if (empty($name) || empty($email)) {
        $error_message = "Please fill out all required fields.";
    } else {
        // Process form data
        // Insert data into database, send email, etc.
    }
}
?>