How can PHP be used to manipulate user input in HTML forms?

PHP can be used to manipulate user input in HTML forms by accessing the form data using the `$_POST` or `$_GET` superglobals in PHP. Once the form data is accessed, PHP can validate, sanitize, and manipulate the user input before processing it further. This helps in ensuring the security and integrity of the data submitted by users. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST['username'];
    $email = $_POST['email'];

    // Validate and sanitize user input
    $username = htmlspecialchars($username);
    $email = filter_var($email, FILTER_SANITIZE_EMAIL);

    // Further processing of the sanitized data
    // ...
}
?>

Keywords

PHP user input HTML forms manipulation validation

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