What are the best practices for handling form validation in PHP to prevent unnecessary server requests?

To prevent unnecessary server requests when handling form validation in PHP, it is recommended to perform client-side validation using JavaScript before submitting the form to the server. This way, common validation errors can be caught and corrected on the client side without needing to send a request to the server. However, it is still important to perform server-side validation to ensure data integrity and security. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Perform client-side validation using JavaScript before submitting the form
    // Server-side validation to ensure data integrity and security
    // Process the form data if validation passes
}
?>

Keywords

form validation PHP server requests error handling data validation

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