What are the potential pitfalls of using PHP in conjunction with JavaScript for form submission?

One potential pitfall of using PHP in conjunction with JavaScript for form submission is the risk of bypassing server-side validation. To mitigate this risk, it is crucial to perform validation both on the client-side using JavaScript and on the server-side using PHP. This ensures that data integrity and security are maintained regardless of any client-side manipulation. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Server-side validation
    $name = $_POST['name'];
    $email = $_POST['email'];

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

Keywords

PHP JavaScript form submission security vulnerabilities cross-site scripting

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