php一个自定义分页类的解决办法

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/**
 * 一个自定义的php分页类代码
 *
 * @param 
 * @arrange 512-笔记网： 512Pic.com
 **/
<?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 = "&#187;"; //&#9658;
 var $prevT = "Previous";
 var $prevI = "&#171;"; //&#9668;
 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;
 }
}
/***   来自php教程（www.idcnote.com）   ***/

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