How can the user improve the code structure and readability of the PHP registration script?

The user can improve the code structure and readability of the PHP registration script by breaking down the code into smaller, more manageable functions, using meaningful variable names, adding comments to explain complex logic, and following a consistent coding style. 

// Example of improved PHP registration script with better structure and readability

// Function to validate user input
function validate_input($input) {
    // Validation logic here
}

// Function to sanitize user input
function sanitize_input($input) {
    // Sanitization logic here
}

// Function to register a new user
function register_user($username, $email, $password) {
    // Registration logic here
}

// Main registration script
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = sanitize_input($_POST["username"]);
    $email = sanitize_input($_POST["email"]);
    $password = sanitize_input($_POST["password"]);

    if (validate_input($username) && validate_input($email) && validate_input($password)) {
        register_user($username, $email, $password);
    } else {
        echo "Invalid input. Please try again.";
    }
}

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