How can the code be modified to ensure proper sorting of the data based on the 'level' column?

The issue can be solved by using the PHP `usort` function to sort the data array based on the 'level' column. The `usort` function allows us to define a custom comparison function that compares the 'level' values of two elements in the array. By using this function, we can ensure that the data is properly sorted based on the 'level' column.

// Define a custom comparison function to sort the data based on the 'level' column
function compareLevels($a, $b) {
    return $a['level'] - $b['level'];
}

// Sort the data array based on the 'level' column using usort
usort($data, 'compareLevels');

// Output the sorted data
foreach ($data as $row) {
    echo $row['name'] . ' - Level ' . $row['level'] . '<br>';
}