What role does the var_dump function play in debugging PHP code related to session variables and database queries?

When debugging PHP code related to session variables and database queries, the var_dump function plays a crucial role in displaying the contents of variables and data structures. By using var_dump, you can inspect the values stored in session variables and the results of database queries, helping you identify any issues or errors in your code.

// Example of using var_dump to debug session variables and database queries
// Display the contents of session variables
var_dump($_SESSION);

// Execute a database query and display the results
$query = "SELECT * FROM users";
$result = mysqli_query($connection, $query);

while ($row = mysqli_fetch_assoc($result)) {
    var_dump($row);
}