How can the use of mysql_error() function help in debugging PHP code?

Using the mysql_error() function in PHP can help in debugging code by providing detailed error messages when there is an issue with a MySQL query. This function can help identify errors such as syntax errors, connection problems, or permission issues, making it easier to pinpoint and fix the problem.

// Example of using mysql_error() function for debugging
$query = "SELECT * FROM users WHERE id = 1";
$result = mysqli_query($connection, $query);

if (!$result) {
    echo "Error: " . mysql_error($connection);
} else {
    // Process the query result
}