How can the validation of JavaScript affect the overall validity of PHP code in a webpage?

When JavaScript validation is used on a webpage, it can help improve the user experience by providing instant feedback on form inputs. However, it is important to remember that JavaScript validation is client-side, meaning it can be bypassed by users. To ensure the overall validity of PHP code, server-side validation should also be implemented to double-check user inputs before processing them. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    
    // Server-side validation to ensure name is not empty
    if (empty($name)) {
        $error = "Name is required";
    } else {
        // Process the form data
    }
}
?>

Keywords

JavaScript validation PHP code webpage overall validity error types

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