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<?php
/*
* PHP Pagination Class
*
* @author David Carr - dave@daveismyname.com - http://www.daveismyname.com
* @version 1.0
* @date October 20, 2013
*/
class Paginator{
/**
* set the number of items per page.
*
* @var numeric
*/
private $_perPage;
/**
* set get parameter for fetching the page number
*
* @var string
*/
private $_instance;
/**
* sets the page number.
*
* @var numeric
*/
private $_page;
/**
* set the limit for the data source
*
* @var string
*/
private $_limit;
/**
* set the total number of records/items.
*
* @var numeric
*/
private $_totalRows = 0;
/**
* __construct
*
* pass values when class is istantiated
*
* @param numeric $_perPage sets the number of iteems per page
* @param numeric $_instance sets the instance for the GET parameter
*/
public function __construct($perPage,$instance){
$this->_instance = $instance;
$this->_perPage = $perPage;
$this->set_instance();
}
/**
* get_start
*
* creates the starting point for limiting the dataset
* @return numeric
*/
private function get_start(){
return ($this->_page * $this->_perPage) - $this->_perPage;
}
/**
* set_instance
*
* sets the instance parameter, if numeric value is 0 then set to 1
*
* @var numeric
*/
private function set_instance(){
$this->_page = (int) (!isset($_GET[$this->_instance]) ? 1 : $_GET[$this->_instance]);
$this->_page = ($this->_page == 0 ? 1 : $this->_page);
}
/**
* set_total
*
* collect a numberic value and assigns it to the totalRows
*
* @var numeric
*/
public function set_total($_totalRows){
$this->_totalRows = $_totalRows;
}
/**
* get_limit
*
* returns the limit for the data source, calling the get_start method and passing in the number of items perp page
*
* @return string
*/
public function get_limit(){
if (STORAGE == 'postgres') {
return "LIMIT ".$this->_perPage." OFFSET ".$this->get_start();
} else {
return "LIMIT ".$this->get_start().",".$this->_perPage;
}
}
/**
* page_links
*
* create the html links for navigating through the dataset
*
* @var sting $path optionally set the path for the link
* @var sting $ext optionally pass in extra parameters to the GET
* @return string returns the html menu
*/
public function page_links($path='?',$ext=null)
{
$adjacents = "2";
$prev = $this->_page - 1;
$next = $this->_page + 1;
$lastpage = ceil($this->_totalRows/$this->_perPage);
$lpm1 = $lastpage - 1;
$pagination = "";
if($lastpage > 1)
{
$pagination .= "<div class='pagination'>";
if ($this->_page > 1)
$pagination.= "<a href='".$path."$this->_instance=$prev"."$ext'>« previous</a>";
else
$pagination.= "<span class='disabled'>« previous</span>";
if ($lastpage < 7 + ($adjacents * 2))
{
for ($counter = 1; $counter <= $lastpage; $counter++)
{
if ($counter == $this->_page)
$pagination.= "<span class='current'>$counter</span>";
else
$pagination.= "<a href='".$path."$this->_instance=$counter"."$ext'>$counter</a>";
}
}
elseif($lastpage > 5 + ($adjacents * 2))
{
if($this->_page < 1 + ($adjacents * 2))
{
for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
{
if ($counter == $this->_page)
$pagination.= "<span class='current'>$counter</span>";
else
$pagination.= "<a href='".$path."$this->_instance=$counter"."$ext'>$counter</a>";
}
$pagination.= "...";
$pagination.= "<a href='".$path."$this->_instance=$lpm1"."$ext'>$lpm1</a>";
$pagination.= "<a href='".$path."$this->_instance=$lastpage"."$ext'>$lastpage</a>";
}
elseif($lastpage - ($adjacents * 2) > $this->_page && $this->_page > ($adjacents * 2))
{
$pagination.= "<a href='".$path."$this->_instance=1"."$ext'>1</a>";
$pagination.= "<a href='".$path."$this->_instance=2"."$ext'>2</a>";
$pagination.= "...";
for ($counter = $this->_page - $adjacents; $counter <= $this->_page + $adjacents; $counter++)
{
if ($counter == $this->_page)
$pagination.= "<span class='current'>$counter</span>";
else
$pagination.= "<a href='".$path."$this->_instance=$counter"."$ext'>$counter</a>";
}
$pagination.= "..";
$pagination.= "<a href='".$path."$this->_instance=$lpm1"."$ext'>$lpm1</a>";
$pagination.= "<a href='".$path."$this->_instance=$lastpage"."$ext'>$lastpage</a>";
}
else
{
$pagination.= "<a href='".$path."$this->_instance=1"."$ext'>1</a>";
$pagination.= "<a href='".$path."$this->_instance=2"."$ext'>2</a>";
$pagination.= "..";
for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter <= $lastpage; $counter++)
{
if ($counter == $this->_page)
$pagination.= "<span class='current'>$counter</span>";
else
$pagination.= "<a href='".$path."$this->_instance=$counter"."$ext'>$counter</a>";
}
}
}
if ($this->_page < $counter - 1)
$pagination.= "<a href='".$path."$this->_instance=$next"."$ext'>next »</a>";
else
$pagination.= "<span class='disabled'>next »</span>";
$pagination.= "</div>\n";
}
return $pagination;
}
}
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