如果左边的记录条数小于$space(页码区段)的值，页码$start从1开始向右增值。如果左则的记录条数多于$left(左右各显示页数)的值，$start将从左边记录数减去$left值开始记数。

/** 实现同类产品翻页 **/

class pager

{

protected $space;

protected $left;

protected $DB;

protected $pageName;

public function setSpace($num) {

$this->space = $num;

$this->left = ceil(($num-1)/2);

}

public function setDB(&$db) {

$this->DB = $db;

}

public function setPageName($pageName) {

$this->pageName = $pageName;

}

public function getPages($catid, $exptime) {

$fields = array("`id`,`title`");

$left = array(">" => array("exptime"=>$exptime), "memberid" => gs(_MEM_PREFIX_ . "memberid"), "catid"=>$catid);

$right = array(" array("exptime"=>$exptime), "memberid" => gs(_MEM_PREFIX_ . "memberid"), "catid"=>$catid);

$leftCount = $this->DB->getCount($left);

if($leftCount <= $this->left) {

$star = 1;

$leftLimit = "LIMIT" . $leftCount;

$rightLimit = "LIMIT " . ($this->space-$leftCount);

}

else {

$start = $leftCount - $this->left;

$leftLimit = "LIMIT " . $this->left;

$rightLimit = $leftLimit;

}

$list1 = $this->DB->findAll($left, array("exptime"=>"ASC"), $leftLimit, $fields);

$list2 = $this->DB->findAll($right, array("exptime"=>"DESC"), $rightLimit, $fields);

/** 上一页链接 **/

$c = count($list1);

if($c > 1) {

$url = $this->pageName."-".$list1[$c]['id'].".html";

$pages = "上一页

1. ";

}elseif($c == 1) {

$url = $this->pageName."-".$list1[0]['id'].".html";

$pages = "上一页

1. ";

}else {

$pages = "";

}

/** 当前页的左边内容 **/

foreach($list1 as $item) {

$url = $this->pageName."-".$item['id'].".html";

$pages .= "

{$start}";

$start++;

}

$pages .= "

{$leftCount}";

$start++;

/** 当前页面右边的内容 **/

foreach($list1 as $item) {

$url = $this->pageName."-".$item['id'].".html";

$pages .= "

{$start}";

$start++;

}

/** 下一页的链接 **/

$c = count($list2);

if($c > 0) {

$url = $this->pageName."-".$list2[0]['id'].".html";

$pages .= "下一页

1. ";

}else {

$pages .= "";

}

return $pages;

}

};

?>