What are some common pitfalls when using LEFT JOIN in PHP with multiple tables?

One common pitfall when using LEFT JOIN in PHP with multiple tables is forgetting to specify the correct join conditions for each table, leading to unexpected results or errors. To avoid this issue, always double-check and ensure that the join conditions are correctly specified for each table involved in the query.

// Example of a correct LEFT JOIN query with multiple tables
$query = "SELECT users.username, orders.order_id, products.product_name 
          FROM users 
          LEFT JOIN orders ON users.user_id = orders.user_id 
          LEFT JOIN products ON orders.product_id = products.product_id";
$result = mysqli_query($connection, $query);

// Loop through the results
while($row = mysqli_fetch_assoc($result)) {
    // Process the data as needed
}