codeigniter php photo gallery previos and next button

i have created photo gallery in codeigniter php, I have added previous and next button by using this code

$next = $this->uri->segment(3)+1;
previous = $this->uri->segment(3)-1;

The problem with the above approach is if next few id's are broken gallery t开发者_运维问答erminates. Is there an easy solution for this ? i want photos to end when related gallery pictures ends, and it continues to play even if id's are missing or that id is taken by another category.

You could possibly use the Pagination Class in Code Igniter,

If we could see some more of your code we could help...