How can the use of mysql_free_result() function lead to errors in PHP scripts?

Using the mysql_free_result() function in PHP scripts can lead to errors if the result resource is already freed or if the resource is not a valid result resource. To avoid these errors, it's better to use mysqli_free_result() function instead, which is the improved version of the function for MySQLi extension.

// Correct way to free a result set in PHP using mysqli_free_result()
$result = mysqli_query($connection, $query);
// Process the result set
mysqli_free_result($result);