Alibaba download 2013 free download php imitation Alibaba realizes page turning of similar products

If the number of records on the left is less than the value of $space (page number section), the page number $start increases from 1 to the right. If the number of records on the left is more than the value of $left (the number of pages displayed on the left and right), $start will start counting by subtracting the $left value from the number of records on the left.

Copy code The code is as follows:

/**Realize page turning of similar products **/
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);
/**Previous page link **/
$c = count($list1);
if($c > 1) {
$url = $this->pageName." -".$list1[$c]['id'].".html";
$pages = "Previous page

";
}elseif($c == 1) {
$url = $this->pageName."-".$list1[0]['id'].".html";
$pages = "< ;a href="{$url}">Previous page
";
}else {
$pages = "";
}
/**Content on the left of the current page **/
foreach ($list1 as $item) {
$url = $this->pageName."-".$item['id'].".html";
$pages .= "
1. {$start}
";
$start++;
}
$pages .= "
2. {$leftCount}< ;/b>
";
$start++;
/**Content on the right side of the current page **/
foreach($list1 as $item) {
$url = $this->pageName."-".$ item['id'].".html";
$pages .= "
3. {$start}
" ;
$start++;
}
/**Link to next page **/
$c = count($list2);
if($c > 0) {
$url = $this->pageName."-" .$list2[0]['id'].".html";
$pages .= "Next page
";
}else {
$pages .= "";
}
return $pages;
}
};
?>


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