-string
'cut 6 first words
$title = substr(base_url(),6);

'cut 6 last word
$title = substr($title,0,-6);

'get 6 last word
$title = substr($title,-6);


-text
'get 15 first word from 0 first string
substr($page_url,0,15)

'get 15 first word from 3 first string
substr($page_url,3,15)

'get first word from 3 last string
substr($page_url,-3,0)