What are the best practices for passing and tracking data between PHP and HTML elements in a form submission?

When passing and tracking data between PHP and HTML elements in a form submission, it is best to use the POST method to securely send data from the form to the PHP script. You can access the form data in PHP using the $_POST superglobal array, and then process and validate the data as needed. To track data between PHP and HTML elements, you can use hidden input fields in the form to store values that can be accessed and manipulated in the PHP script. 

<form method="post" action="process_form.php">
    <input type="text" name="username">
    <input type="password" name="password">
    <input type="hidden" name="hidden_data" value="example">
    <button type="submit">Submit</button>
</form>

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

    // Process and validate form data
}
?>

Keywords

PHP HTML form submission data passing data tracking

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