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"Previous" and "next" links are one of the necessary evils any middleware developer has to script sooner or later.
Whenever you display a lot of elements of a list, like news, entries in a guestbook, or search results, it's a good idea to limit the displayed items to a certain number per page.
Not only to avoid long rendering times, but also to make it easier for the user to scan for his desired item and to prevent scrolling.
Ok, we need them, let's do them. First thing you do is to analyse the logic behind "previous" and "next" links.
There are loads of solutions for this issue, most of them using a lot of "if" and "else" statements. Especially displaying the elements while making sure that there are still some, and checking that the start of the "next" link does not exceed the number of available elements can be quite a headache.
Unless you use some of the beautiful functions of PHP that do almost all the necessary comparisons for you.
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