Simple class for generating pagination links.

class.pagination.php

<?php
class pagination {
	private $forward = true;
	private $backward = true;
	private $current_page;
	private $last_page;

	function __construct($current_page=false, $last_page=false, $generate=false) {
		if ($current_page) {
			$this->current_page = $current_page;
		}
		if ($last_page) {
			$this->last_page = $last_page;
		}
		if ($generate) {
			$this->process();
		}
	}

	/* ~~~~~~~~~~~~~~~
	   ~~~ Setters ~~~
	   ~~~~~~~~~~~~~~~ */
	public function set_current_page($current) {
		$this->current_page = $current;
	}

	public function set_last_page($last) {
		$this->last_page = $last;
	}

	/* ~~~~~~~~~~~~~~~
	   ~~~ Getters ~~~
	   ~~~~~~~~~~~~~~~ */
	public function get_current_page() {
		return $this->current_page;
	}

	public function get_last_page() {
		return $this->last_page;
	}

	public function get_forward() {
		return $this->forward;
	}

	public function get_backward() {
		return $this->backward;
	}

	public function get_previous_page() {
		return $this->current_page - 1;
	}

	public function get_next_page() {
		return $this->current_page + 1;
	}

	public function get_pagerange($range = 5) {
		$step = (int)($range / 2);
		// Start and End points
		if (($this->current_page - $step) < 1) {
			$start = 1;
			$end = ($range > $this->last_page) ? $this->last_page : $range;
		} elseif (($this->current_page + $step) > $this->last_page) {
			$end = $this->last_page;
			$start = (($end-$range) < 1) ? 1 : ($end-$range);
		} else {
			$start = $this->current_page - $step;
			$end = $this->current_page + $step;
		}
		// Generating range. Current page is false, all other spots are true.
		$range = range($start,$end);
		$return = array();
		foreach ($range as $spot) {
			if ($spot == $this->current_page) {
				$return[$spot] = false;
			} else {
				$return[$spot] = true;
			}
		}
		return $return;
	}


	/* ~~~~~~~~~~~~~~~
	   ~~~ Helpers ~~~
	   ~~~~~~~~~~~~~~~ */
	public function calculate_current_and_last_page($start_index, $total_items, $items_per_page, $set=false, $process=true) {
		$current_page = (int)($start_index / $items_per_page)+1;
		$last_page = (int)($total_items / $items_per_page);
		if (($total_items % $items_per_page) > 0) {
			$last_page++;
		}
		if ($set) {
			$this->set_current_page($current_page);
			$this->set_last_page($last_page);
			if ($process) {
				$this->process();
			}
		}
	}
	public function calculate_last_page($total_items, $items_per_page, $set=false, $process=true) {
		$last_page = (int)($total_items / $items_per_page);
		if (($total_items % $items_per_page) > 0) {
			$last_page++;
		}
		if ($set) {
			$this->set_last_page($last_page);
			if ($process) {
				$this->process();
			}
		} else {
			return $last_page;
		}
	}

	public function process() {
		if ($this->current_page == 1) {
			$this->backward = false;
		} elseif ($this->current_page == $this->last_page) {
			$this->forward = false;
		}
	}
}
?>