Get page type to display content

Question

I have some checkboxes to select where can I display my plugin and I save in db in this format:

Show popup in this pages:

x Article (Public)

x Pages (Public)

x File (Public)

x Revisions (Not public)

Those settings I save in db in this format: So if i CHECKED to show popup in post and pages i have

a:2:{i:0;s:4:"post";i:1;s:4:"page";}

How to add some filters or to check when to display content? Something like:

if(in_array(current_page, my_array_with_accepted_pages)) show something

or just add some filters and the plugin will now where to display the content.