How can PHP developers effectively debug and troubleshoot issues related to data transfer between HTML and PHP?

When debugging data transfer issues between HTML and PHP, developers can start by checking the form method (POST or GET) and ensuring that form elements have correct names. They can use var_dump or print_r functions in PHP to display the data being transferred and check for any errors. Additionally, developers can use browser developer tools to inspect network requests and responses for any anomalies. 

<?php
// Check form method and form element names
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST['username'];
    $password = $_POST['password'];

    // Debugging data transfer
    var_dump($username);
    var_dump($password);
}
?>

Keywords

PHP debugging troubleshooting data transfer HTML error handling

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