$this->table->set_heading() with row numbering?

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Code:

public function add_table_id()
{
    // Grab an array of users from the database
    $data = $this->your_model->your_function();

    // Setting headings for the table
    $this->table->set_heading('Row id', 'heading 2', 'heading 3', 'keep adding');

    $row_id = 1;

    foreach ($data as $value => $key)
    {
        // Adding row to table
        $this->table->add_row($row_id, $key['field1'], $key['field2'], $key['keep adding what you need']);
        $row_id++;
    }
}