PHP implements imitation of Alibaba to realize page turning of similar products_PHP tutorial

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";
$pages = "< a href="{$url}">Previous page

";
}elseif($c == 1) {
$url = $this->pageName ."-".$list1[0]['id'].".html";
$pages = "Previous page< ;ol>";
}else {
$pages = "";
}


/**Content on the left of the current page **/
foreach($list1 as $ item) {
$url = $this->pageName."-".$item['id'].".html";
$pages .= "
1. {$start}
";
$start++;
}

$pages .= "
2. < ;b>{$leftCount}
";
$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;
}
};
?>

http://www.bkjia.com/PHPjc/320934.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/320934.htmlTechArticleIf the number of records on the left is less than the value of $space (page number section), the page number $start starts from 1 and goes to Right value added. 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 be from the left...