Having trouble with a foreach loop

Just use var_dump($keywords) to find out what exactly the content is (and type of data) of that variable.

You say it suppose to be an array, so have you tried:

PHP Code:

foreach ($keywords as $key => $keyword) {
   ...
} 


That being said, you do know that CodeIgniter has some useragent detection build in?

PHP Code:

$this->load->library('user_agent');

if ($this->agent->is_robot()) {
    ...
} 


https://www.codeigniter.com/userguide3/l...agent.html