What are the best practices for passing data between HTML and PHP in a web application?

When passing data between HTML and PHP in a web application, it is important to use form submission methods like POST or GET to securely transfer data from the HTML form to the PHP script. To retrieve the data in PHP, you can use superglobal arrays such as $_POST or $_GET to access the form input values. Sanitize and validate the input data to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. 

// HTML form
<form method="post" action="process_data.php">
    <input type="text" name="username">
    <input type="password" name="password">
    <button type="submit">Submit</button>
</form>

// process_data.php
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST['username'];
    $password = $_POST['password'];

    // Sanitize and validate input data
    $username = filter_var($username, FILTER_SANITIZE_STRING);
    $password = filter_var($password, FILTER_SANITIZE_STRING);

    // Perform further processing with the data
}
?>

Keywords

HTML PHP data passing web application security

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