What are the potential drawbacks of using JavaScript for form validation in PHP?

Using JavaScript for form validation in PHP can lead to potential security vulnerabilities as client-side validation can be bypassed by users. To ensure secure form validation, it is recommended to perform server-side validation in PHP to validate the data submitted by users before processing it further.

// Server-side form validation in PHP
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    $email = $_POST["email"];
    
    // Validate name and email
    if (empty($name) || empty($email)) {
        echo "Name and email are required.";
    } else {
        // Process the form data
    }
}