What are the differences between client-side validation using JavaScript and server-side validation using PHP?

Client-side validation using JavaScript occurs on the user's browser before the form data is submitted to the server, providing instant feedback to the user. Server-side validation using PHP takes place on the server after the form data is submitted, ensuring data integrity and security. It is recommended to use both client-side and server-side validation to provide a seamless user experience while also protecting against malicious attacks. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    
    // Server-side validation
    if (empty($name)) {
        $error = "Name is required";
    } else {
        // Process the form data
    }
}
?>

Keywords

client-side validation JavaScript server-side validation PHP error handling

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