/system/core/pagination.php

<?php
/*
+--------------------------------------------------------------------------
|   Anwsion [#RELEASE_VERSION#]
|   ========================================
|   by Anwsion dev team
|   (c) 2011 - 2012 Anwsion Software
|   http://www.anwsion.com
|   ========================================
|   Support: zhengqiang@gmail.com
|   
+---------------------------------------------------------------------------
*/

class core_pagination
{
	var $base_url			= ''; // The page we are linking to
	var $prefix				= ''; // A custom prefix added to the path.
	var $suffix				= ''; // A custom suffix added to the path.

	var $total_rows			= ''; // Total number of items (database results)
	var $per_page			= 10; // Max number of items you want shown per page
	var $num_links			=  2; // Number of "digit" links to show before/after the currently viewed page
	var $cur_page			=  0; // The current page being viewed
	var $first_link			= '&lsaquo; First';
	var $next_link			= '&gt;';
	var $prev_link			= '&lt;';
	var $last_link			= 'Last &rsaquo;';
	var $uri_segment		= 3;
	var $full_tag_open		= '';
	var $full_tag_close		= '';
	var $first_tag_open		= '';
	var $first_tag_close	= '&nbsp;';
	var $last_tag_open		= '&nbsp;';
	var $last_tag_close		= '';
	var $first_url			= ''; // Alternative URL for the First Page.
	var $cur_tag_open		= '&nbsp;<strong>';
	var $cur_tag_close		= '</strong>';
	var $next_tag_open		= '&nbsp;';
	var $next_tag_close		= '&nbsp;';
	var $prev_tag_open		= '&nbsp;';
	var $prev_tag_close		= '';
	var $num_tag_open		= '&nbsp;';
	var $num_tag_close		= '';
	var $query_string_segment = 'page';
	var $display_pages		= TRUE;
	var $direct_page		= FALSE;
	
	/**
	 * Constructor
	 *
	 * @access	public
	 * @param	array	initialization parameters
	 */
	public function __construct($params = array())
	{		
		if (file_exists(ROOT_PATH . 'views/' . get_setting('ui_style') . '/config/pagination.php'))
		{
			include(ROOT_PATH . 'views/' . get_setting('ui_style') . '/config/pagination.php');
		}
		else
		{
			include(ROOT_PATH . 'views/default/config/pagination.php');
		}
		
		$this->initialize($config);
		
		if (count($params) > 0)
		{
			$this->initialize($params);
		}

		if ($this->anchor_class != '')
		{
			$this->anchor_class = 'class="'.$this->anchor_class.'" ';
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Initialize Preferences
	 *
	 * @access	public
	 * @param	array	initialization parameters
	 * @return	void
	 */
	public function initialize($params = array())
	{
		if (count($params) > 0)
		{
			foreach ($params as $key => $val)
			{
				if (isset($this->$key))
				{
					$this->$key = $val;
				}
			}
		}
		
		return $this;
	}

	// --------------------------------------------------------------------

	/**
	 * Generate the pagination links
	 *
	 * @access	public
	 * @return	string
	 */
	public function create_links()
	{
		// If our item count or per-page total is zero there is no need to continue.
		if ($this->total_rows == 0 OR $this->per_page == 0)
		{
			return '';
		}

		// Calculate the total number of pages
		$num_pages = ceil($this->total_rows / $this->per_page);

		// Is there only one page? Hm... nothing more to do here then.
		if ($num_pages == 1)
		{
			return '';
		}

		if ($_GET[$this->query_string_segment] != 0)
		{
			$this->cur_page = $_GET[$this->query_string_segment];

			// Prep the current page - no funny business!
			$this->cur_page = (int) $this->cur_page;
		}
		else
		{
			$this->cur_page = 1;
		}

		$this->num_links = (int)$this->num_links;

		if ($this->num_links < 1)
		{
			die('Your number of links must be a positive number.');
		}

		if ( ! is_numeric($this->cur_page))
		{
			$this->cur_page = 0;
		}

		// Is the page number beyond the result range?
		// If so we show the last page
		if ($this->cur_page > $this->total_rows)
		{
			$this->cur_page = ($num_pages - 1) * $this->per_page;
		}

		$uri_page_number = $this->cur_page;
		//$this->cur_page = floor(($this->cur_page/$this->per_page) + 1);

		// Calculate the start and end numbers. These determine
		// which number to start and end the digit links with
		$start = (($this->cur_page - $this->num_links) > 0) ? $this->cur_page - ($this->num_links - 1) : 1;
		$end   = (($this->cur_page + $this->num_links) < $num_pages) ? $this->cur_page + $this->num_links : $num_pages;


		if (substr($this->base_url, -1, 1) == '/')
		{
			$this->base_url = rtrim($this->base_url).$this->query_string_segment.'-';
		}
		else
		{
			$this->base_url = rtrim($this->base_url).'__'.$this->query_string_segment.'-';
		}

		// And here we go...
		$output = '';

		// Render the "First" link
		if  ($this->first_link !== FALSE AND $this->cur_page > ($this->num_links + 1))
		{
			$first_url = ($this->first_url == '') ? $this->base_url : $this->first_url;
			$output .= $this->first_tag_open.'<a '.$this->anchor_class.'href="'.$first_url.'">'.$this->first_link.'</a>'.$this->first_tag_close;
		}

		// Render the "previous" link
		if  ($this->prev_link !== FALSE AND $this->cur_page != 1)
		{
			//$i = $uri_page_number - $this->per_page;
			$i = $uri_page_number - 1;

			if ($i == 0 && $this->first_url != '')
			{
				$output .= $this->prev_tag_open.'<a '.$this->anchor_class.'href="'.$this->first_url.'">'.$this->prev_link.'</a>'.$this->prev_tag_close;
			}
			else
			{
				$i = ($i == 0) ? '' : $this->prefix.$i.$this->suffix;
				$output .= $this->prev_tag_open.'<a '.$this->anchor_class.'href="'.$this->base_url.$i.'">'.$this->prev_link.'</a>'.$this->prev_tag_close;
			}

		}

		// Render the pages
		if ($this->display_pages !== FALSE)
		{
			// Write the digit links
			for ($loop = $start -1; $loop <= $end; $loop++)
			{
				$i = ($loop * $this->per_page) - $this->per_page;

				if ($i >= 0)
				{
					if ($this->cur_page == $loop)
					{
						$output .= $this->cur_tag_open.$loop.$this->cur_tag_close; // Current page
					}
					else
					{
						$n = ($i == 0) ? '' : $i;
						
						$n = $n / $this->per_page + 1;	// by Anwsion

						if ($n == '' && $this->first_url != '')
						{
							$output .= $this->num_tag_open.'<a '.$this->anchor_class.'href="'.$this->first_url.'">'.$loop.'</a>'.$this->num_tag_close;
						}
						else
						{
							$n = ($n == '') ? '' : $this->prefix.$n.$this->suffix;

							$output .= $this->num_tag_open.'<a '.$this->anchor_class.'href="'.$this->base_url.$n.'">'.$loop.'</a>'.$this->num_tag_close;
						}
					}
				}
			}
		}

		// Render the "next" link
		if ($this->next_link !== FALSE AND $this->cur_page < $num_pages)
		{
			//$output .= $this->next_tag_open.'<a '.$this->anchor_class.'href="'.$this->base_url.$this->prefix.($this->cur_page * $this->per_page).$this->suffix.'">'.$this->next_link.'</a>'.$this->next_tag_close;
			$output .= $this->next_tag_open.'<a '.$this->anchor_class.'href="'.$this->base_url.$this->prefix.($this->cur_page + 1).$this->suffix.'">'.$this->next_link.'</a>'.$this->next_tag_close;
		}

		// Render the "Last" link
		if ($this->last_link !== FALSE AND ($this->cur_page + $this->num_links) < $num_pages)
		{
			//$i = (($num_pages * $this->per_page) - $this->per_page);
			$i = $num_pages;
			$output .= $this->last_tag_open.'<a '.$this->anchor_class.'href="'.$this->base_url.$this->prefix.$i.$this->suffix.'">'.$this->last_link.'</a>'.$this->last_tag_close;
		}
		
		if ($this->direct_page)
		{
			$output .= '<input name="page_jumper" type="text" style="width:30px;"/> <input type="button" value="Go" onClick="window.location = \'' . $this->base_url.$this->prefix . '\' + $(this).parent().find(\'[name=page_jumper]\').val() + \'\';"/>';
		}
		
		// Kill double slashes.  Note: Sometimes we can end up with a double slash
		// in the penultimate link so we'll kill all double slashes.
		$output = preg_replace("#([^:])//+#", "\\1/", $output);

		// Add the wrapper HTML if exists
		$output = $this->full_tag_open.$output.$this->full_tag_close;

		return $output;
	}
}