一个自定义的php分页类代码
<?php
class Pagination
{
// Default values
var $items = -1;
var $limit = NULL;
var $target = "";
var $page = 1;
var $adjacents = 1;
var $showCounter = FALSE;
var $className = "pagination";
var $parameterName = "page";
// urlFriendly
var $urlF = FALSE;
var $rebuildQuery = TRUE;
var $allowedParams = array();
// Buttons next and previous
var $nextT = "Next";
var $nextI = ""; //
var $prevT = "Previous";
var $prevI = ""; //
var $pagination;
var $calculate = FALSE;
// -------------------------------------------------------------------------
/**
* Constructor
*
*/
public function __construct($params = array())
{
// initialize with parameters
if (is_array($params) OR is_object($params))
{
foreach ($params as $name => $value)
{
if (property_exists($this, $name))
{
$this->{$name} = $value;
}
}
}
}
// -------------------------------------------------------------------------
/**
* Helper Method - Calculate page offset
*
* @param Integer $page current page
* @param Integer $limit Limit result per page
* @return Integer offset to use for sql
*/
static function page_offset($page, $limit)
{
$page = $page ? (int) $page : 1 ;
return ($page - 1) * $limit;
}
// -------------------------------------------------------------------------
/**
* Set total items
*
* @param Integer $value total number of items
*/
public function items($value)
{
$this->items = (int) $value;
}
// -------------------------------------------------------------------------
/**
* Items to show per page
*
* @param Integer $value result per page
*/
public function limit($value)
{
$this->limit = (int) $value;
}
// -------------------------------------------------------------------------
/**
* Page to sent the page value
*
* @param String $value base link target
*/
public function target($link_target)
{
$this->target = $link_target;
if ( ! $this->rebuildQuery)
{
return;
}
// rebuild GET query
$query = $this->_rebuild_query();
// only append query when has parameter to append
if ( ! empty($query))
{
$this->target .= '?' . $query;
}
}
// -------------------------------------------------------------------------
/**
* Set current page
*
* @param Integer $value current page
*/
public function currentPage($value)
{
$this->page = (int) $value;
}
// -------------------------------------------------------------------------
/**
* How many adjacent pages should be shown on each side of the current page?
*
* @param Integer $value number of adjacent pages to show
*/
public function adjacents($value)
{
$this->adjacents = (int) $value;
}
// -------------------------------------------------------------------------
/**
* show counter?
*
* @param Boolean $value show counter?
*/
public function showCounter($value = "")
{
$this->showCounter = ($value === TRUE) ? TRUE: FALSE;
}
// -------------------------------------------------------------------------
/**
* change the class name of the pagination div
*
* @param String $value you desired class name
*/
public function changeClass($value = "")
{
$this->className = $value;
}
// -------------------------------------------------------------------------
/**
* Label of the "Next" link
*
* @param String $value "next" text
*/
public function nextLabel($value)
{
$this->nextT = $value;
}
// -------------------------------------------------------------------------
/**
* Icon entity of the "Next" link
*
* @param String $value html entity code
*/
public function nextIcon($value)
{
$this->nextI = $value;
}
// -------------------------------------------------------------------------
/**
* Label of the "Prev" link
*
* @param String $value Label of the "Prev" link
*/
public function prevLabel($value)
{
$this->prevT = $value;
}
// -------------------------------------------------------------------------
/**
* Icon entity of the "Prev" link
*
* @param String $value html entiry code to use as Prev Icon
*/
public function prevIcon($value)
{
$this->prevI = $value;
}
// -------------------------------------------------------------------------
/**
* Change the parameter name if the page param
*
* @param String $value Name of parameter
*/
public function parameterName($value = "")
{
$this->parameterName = $value;
}
// -------------------------------------------------------------------------
/**
* Set charactor token to use as url mask
*
* @param String $value token string default is %
*/
public function urlFriendly($value = "%")
{
if (eregi('^ *$', $value))
{
$this->urlF = FALSE;
return FALSE;
}
$this->urlF = $value;
}
// -------------------------------------------------------------------------
/**
* Display the pagination
*
*/
public function show()
{
if ( ! $this->calculate)
{
if ($this->calculate())
{
echo "<div class=\"{$this->className}\">{$this->pagination}</div>\n";
}
}
}
// -------------------------------------------------------------------------
/**
* Fetch the pagination output
*
*/
public function getOutput()
{
if ( ! $this->calculate)
{
if ($this->calculate())
{
return "<div class=\"{$this->className}\">{$this->pagination}</div>\n";
}
}
}
// -------------------------------------------------------------------------
/**
* Rebuild HTTP query string
* This method will generate a query string from $_GET array
* note that only allowed parameter in $this->allowedParams array will be processed
*
* @return String query string
*/
protected function _rebuild_query()
{
$params = $_GET;
foreach ($params as $name => $value)
{
// on allowed params will be set, and $this->parameterName will be forced to be deleted
if (( ! empty($this->allowedParams) AND ! in_array($name, $this->allowedParams)) OR $name == $this->parameterName)
{
unset($params[$name]);
}
}
if ( ! count($params))
{
return '';
}
return http_build_query($params);
}
// -------------------------------------------------------------------------
/**
* Helper function to generate a link
*
* @param Integer $id number of page
* @return String full request url
*/
function get_pagenum_link($id)
{
if (strpos($this->target, '?') === FALSE)
{
if ($this->urlF)
{
return str_replace($this->urlF, $id, $this->target);
}
else
{
return "{$this->target}?{$this->parameterName}={$id}";
}
}
else
{
return "{$this->target}&{$this->parameterName}={$id}";
}
}
// -------------------------------------------------------------------------
/**
* Magic method quickly return output of pagination
*
* @return String pagination output
*/
function __toString()
{
return $this->getOutput();
}
// -------------------------------------------------------------------------
/**
* Main process , gathering all data then generate pagination output
*
* @return String pagination output
*/
protected function calculate()
{
$this->pagination = "";
$this->calculate == TRUE;
$error = FALSE;
if ($this->urlF AND $this->urlF != '%' AND strpos($this->target, $this->urlF) === FALSE)
{
//Es necesario especificar el comodin para sustituir
echo "Especificaste un wildcard para sustituir, pero no existe en el target<br />";
$error = TRUE;
}
elseif ($this->urlF AND $this->urlF == '%' AND strpos($this->target, $this->urlF) === FALSE)
{
echo "Es necesario especificar en el target el comodin % para sustituir el número de página<br />";
$error = TRUE;
}
if ($this->items < 0)
{
echo "It is necessary to specify the <strong>number of pages</strong> (\$class->items(1000))<br />";
$error = TRUE;
}
if ($this->limit == NULL)
{
echo "It is necessary to specify the <strong>limit of items</strong> to show per page (\$class->limit(10))<br />";
$error = TRUE;
}
if ($error)
{
return FALSE;
}
$n = trim($this->nextT . ' ' . $this->nextI);
$p = trim($this->prevI . ' ' . $this->prevT);
/* Setup vars for query. */
if($this->page)
{
$start = ($this->page - 1) * $this->limit; //first item to display on this page
}
else
{
$start = 0; //if no page var is given, set start to 0
}
// -------------------------------------------------------------------------
// Setup page vars for display.
//previous page is page - 1
$prev = $this->page - 1;
//next page is page + 1
$next = $this->page + 1;
//lastpage is = total pages / items per page, rounded up.
$lastpage = ceil($this->items/$this->limit);
//last page minus 1
$lpm1 = $lastpage - 1;
// -------------------------------------------------------------------------
// Now we apply our rules and draw the pagination object.
// We're actually saving the code to a variable in case we want to draw it more than once.
if ($lastpage > 1)
{
if ($this->page)
{
//anterior button
if ($this->page > 1)
{
$this->pagination .= "<a href=\"" . $this->get_pagenum_link($prev) . "\" class=\"prev\">{$p}</a>";
}
else
{
$this->pagination .= "<span class=\"disabled\">{$p}</span>";
}
}
// -------------------------------------------------------------------------
// pages
// not enough pages to bother breaking it up
if ($lastpage < 7 + ($this->adjacents * 2))
{
for ($counter = 1; $counter <= $lastpage; $counter++)
{
if ($counter == $this->page)
{
$this->pagination .= "<span class=\"current\">{$counter}</span>";
}
else
{
$this->pagination .= "<a href=\"" . $this->get_pagenum_link($counter) . "\">{$counter}</a>";
}
}
}
// enough pages to hide some
elseif ($lastpage > 5 + ($this->adjacents * 2))
{
// close to beginning; only hide later pages
if($this->page < 1 + ($this->adjacents * 2))
{
for ($counter = 1; $counter < 4 + ($this->adjacents * 2); $counter++)
{
if ($counter == $this->page)
{
$this->pagination .= "<span class=\"current\">{$counter}</span>";
}
else
{
$this->pagination .= "<a href=\"" . $this->get_pagenum_link($counter) . "\">{$counter}</a>";
}
}
$this->pagination .= "...";
$this->pagination .= "<a href=\"" . $this->get_pagenum_link($lpm1) . "\">$lpm1</a>";
$this->pagination .= "<a href=\"" . $this->get_pagenum_link($lastpage) . "\">$lastpage</a>";
}
// in middle; hide some front and some back
elseif ($lastpage - ($this->adjacents * 2) > $this->page AND $this->page > ($this->adjacents * 2))
{
$this->pagination .= "<a href=\"" . $this->get_pagenum_link(1) . "\">1</a>";
$this->pagination .= "<a href=\"" . $this->get_pagenum_link(2) . "\">2</a>";
$this->pagination .= "...";
for ($counter = $this->page - $this->adjacents; $counter <= $this->page + $this->adjacents; $counter++)
{
if ($counter == $this->page)
{
$this->pagination .= "<span class=\"current\">{$counter}</span>";
}
else
{
$this->pagination .= "<a href=\"" . $this->get_pagenum_link($counter) . "\">{$counter}</a>";
}
}
$this->pagination .= "...";
$this->pagination .= "<a href=\"" . $this->get_pagenum_link($lpm1) . "\">{$lpm1}</a>";
$this->pagination .= "<a href=\"" . $this->get_pagenum_link($lastpage) . "\">{$lastpage}</a>";
}
// close to end; only hide early pages
else
{
$this->pagination .= "<a href=\"" . $this->get_pagenum_link(1) . "\">1</a>";
$this->pagination .= "<a href=\"" . $this->get_pagenum_link(2) . "\">2</a>";
$this->pagination .= "...";
for ($counter = $lastpage - (2 + ($this->adjacents * 2)); $counter <= $lastpage; $counter++)
{
if ($counter == $this->page)
{
$this->pagination .= "<span class=\"current\">{$counter}</span>";
}
else
{
$this->pagination .= "<a href=\"" . $this->get_pagenum_link($counter) . "\">{$counter}</a>";
}
}
}
}
if ($this->page)
{
// siguiente button
if ($this->page < $counter - 1)
{
$this->pagination .= "<a href=\"" . $this->get_pagenum_link($next) . "\" class=\"next\">{$n}</a>";
}
else
{
$this->pagination .= "<span class=\"disabled\">$n</span>";
if ($this->showCounter)
{
$this->pagination .= "<div class=\"pagination_data\">({$this->items} Pages)</div>";
}
}
}
}
return true;
}
}
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