Pagination Display

pagination_view.php

<ul class='pager'>
	<?php
		//The goal is to have a pager showing (if available) 5 numbers,
		//with the current page number in the middle, if available.
		// <<First and <Previous are shown if you can't see page 1,
		// and Next> and Last>> are shown if you can't see the last page.
		$start = $currentpage <= 2 ? 1 : $currentpage - 2;
		$end = $currentpage > ($totalpages - 2) ? $totalpages : $currentpage + 2;
		if ($end == $totalpages && $start > 2) {
			$diff = $totalpages - $currentpage;
			$start -= (2 - $diff);
		} else if ($start == 1 && $end < $totalpages) {
			$diff = $currentpage - 1;
			$end += (2 - $diff);
		}
		if ($end > $totalpages) { $end = $totalpages; }
		if (($end - $start) < 4) { $start = 1; }
		if ($start > 1) {
			echo "<li><a href='/1'>&laquo; First</a></li>";
			$prev = $currentpage - 1;
			echo "<li><a href='/$prev'>&lsaquo; Previous</a></li>";
		}
		for($i=$start; $i<=$end; $i++) {
			echo "<li><a ";
			echo $currentpage == $i ? "class='current' " : "";
			echo "href='/$i'>$i</a></li>";
		}
		if($end < $totalpages) {
			$next = $currentpage + 1;
			echo "<li><a href='/$next'>Next &rsaquo;</a></li>";
			echo "<li><a href='/$totalpages'>Last &raquo;</a></li>";
		}
	?>
</ul>

There has to be a nicer formula to accomplish this.

The first half of this is just trying to get the correct $start and $end numbers. This is the part that could use some optimization.