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<?php
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/**
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* Pagination Library
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*
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* @author Zhou Yuan <yuanzhou19@gmail.com>
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* @link http://www.infopotato.com/
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* @copyright Copyright © 2009-2011 Zhou Yuan
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* @license http://www.opensource.org/licenses/mit-license.php MIT Licence
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* @link http://www.catchmyfame.com/2007/07/28/finally-the-simple-pagination-class/
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*/
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class Pagination_Library {
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/**
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* The desired number of items to be shown on each page.
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*
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* @var integer
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*/
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protected $items_per_page = 10;
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/**
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* The total number of items you'll be paginating.
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*
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* @var integer
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*/
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protected $items_total;
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/**
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* The page the user is viewing. Will always be an integer >= 1
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*
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* @var integer
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*/
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protected $current_page = 1;
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/**
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* The CSS class for current page
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*
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* @var string
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*/
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protected $current_page_class = '';
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/**
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* The number of pages to show 'around' the current page, is odd and >=3
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*
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* The mid range is the number of pages that the paginator will display,
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* centered around and including the selected page. For example,
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* if the mid range is set to seven ($this->mid_range = 7;) then
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* when browsing page 50 of 100, the mid range generates links to
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* pages 47, 48, 49, 50, 51, 52, and 53. The mid range moves in relation to
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* the selected page. If the user is at either the low or high end of the list of pages,
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* it will slide the range toward the other side to accommodate the position.
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* For example, if the user visits page 99 of 100, the mid range will generate links for
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* pages 94, 95, 96, 97, 98, 99, and 100.
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*
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* @var integer
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*/
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protected $mid_range = 7;
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/**
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* The base page URI we are linking to
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*
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* @var string
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*/
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protected $base_uri = '';
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/**
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* The pagination data in an array for debug
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*
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* @var array()
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*/
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private $_pagination_data = array();
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/**
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* Constructor
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*/
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public function __construct(array $config = NULL) {
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if (count($config) > 0) {
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foreach ($config as $key => $val) {
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$this->$key = $val;
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}
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}
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}
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/**
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* The build_pagination method is what determines how many page numbers to display,
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* figures out how they should be linked, and applies CSS for styling.
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*
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* @return the pagination string
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*/
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public function build_pagination() {
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// The total number of pages as generated by the pagination class
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$num_pages = ceil($this->items_total/$this->items_per_page);
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// Create the pagination link
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$output = '';
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if ($num_pages > 1) {
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// The number of pages to show 'around' the current page
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$start_range = $this->current_page - floor($this->mid_range/2);
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$end_range = $this->current_page + floor($this->mid_range/2);
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if ($start_range <= 0) {
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$end_range += abs($start_range) + 1;
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$start_range = 1;
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}
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if ($end_range > $num_pages) {
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$start_range -= $end_range - $num_pages;
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$end_range = $num_pages;
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}
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$this->_pagination_data = array(
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'base_uri' => $this->base_uri,
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'items_total' => $this->items_total,
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'items_per_page' => $this->items_per_page,
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'mid_range' => $this->mid_range,
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'current_page' => $this->current_page,
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'current_page_class' => $this->current_page_class,
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'prev_page' => $this->current_page - 1,
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'next_page' => $this->current_page + 1,
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'num_pages' => $num_pages,
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'offset_low' => ($this->current_page - 1) * $this->items_per_page,
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'offset_high' => $this->current_page * $this->items_per_page,
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'range' => range($start_range, $end_range), // Create an array containing a range of elements
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);
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if ($this->_pagination_data['current_page'] > 1) {
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$output = '<a href="'.$this->_pagination_data['base_uri'].$this->_pagination_data['prev_page'].'">«</a> ';
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}
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for ($i = 1; $i <= $this->_pagination_data['num_pages']; $i++) {
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if ($this->_pagination_data['range'][0] > 2 && $i == $this->_pagination_data['range'][0]) {
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$output .= '...';
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}
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if ($i == 1 || $i == $this->_pagination_data['num_pages'] || in_array($i, $this->_pagination_data['range'])) {
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if ($i === $this->_pagination_data['current_page']) {
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$output .= '<span class="'.$this->_pagination_data['current_page_class'].'">'.$i.'</span>';
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} else {
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$output .= '<a href="'.$this->_pagination_data['base_uri'].$i.'">'.$i.'</a>';
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}
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}
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if ($this->_pagination_data['range'][$this->_pagination_data['mid_range']-1] < $this->_pagination_data['num_pages']-1 && $i == $this->_pagination_data['range'][$this->_pagination_data['mid_range']-1]) {
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$output .= '...';
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}
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}
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if ($this->_pagination_data['current_page'] != $this->_pagination_data['num_pages']) {
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$output .= '<a href="'.$this->_pagination_data['base_uri'].$this->_pagination_data['next_page'].'">»</a>';
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}
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}
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return $output;
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}
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/**
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* Get all the pagination metadata
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*
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* @return the pagination data array
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*/
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public function get_pagination_data() {
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return $this->_pagination_data;
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}
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}
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/* End of file: ./system/libraries/pagination/pagination_library.php */
Page URI: http://www.infopotato.com/index.php/code/library/pagination/