当codeigniter中的5行userid都相同时，如何在表中插入5行后停止用户？

$userData = array(
    array('userid' => 1, 'username' => 'user1'),
    array('userid' => 1, 'username' => 'user1'),
    array('userid' => 1, 'username' => 'user1'),
    array('userid' => 1, 'username' => 'user1'),
    array('userid' => 1, 'username' => 'user1')
);

$count = 0; // 计数器

foreach ($userData as $user) {
    $existingRows = $this->db->get_where('your_table_name', array('userid' => $user['userid']))->num_rows();

    if ($existingRows < 5) {
        $this->db->insert('your_table_name', $user);
        $count++;

        if ($count == 5) {
            break; // 停止插入
        }
    }
}