What are the common methods for retrieving HTML values using PHP?

When working with HTML forms, you may need to retrieve the values submitted by the user using PHP. This can be done by accessing the values through the $_POST or $_GET superglobals, depending on the form submission method. You can then use these values in your PHP script for further processing. 

// Retrieving HTML values using PHP
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST['username'];
    $password = $_POST['password'];
    
    // Use the retrieved values for further processing
    // For example, validating the user input or storing it in a database
}

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