Use of PHP paging class

Usage of PHP paging class

page.class.php

 class Page {
 private $total_rows;//Total number of entries in the database
 private $per_page_rows;//Number of entries displayed per page
 private $limit;
 private $ uri;
 private $total_pages;//Total number of pages
 private $config=array("header"=>"Number of records","prev"=>"Previous page","next"=>" Next page","first"=>"Home page","last"=>"Last page");
 private $list_length=8;
 public function __construct($total_rows,$per_page_rows=10,$url_args) {
 $this->total_rows=$total_rows;
 $this->per_page_rows=$per_page_rows;
 $this->uri=$this->get_uri($url_args);
 $this->page = !empty($_GET['page']) ? $_GET['page'] : 1;
 $this->total_pages=ceil($this->total_rows/$this->per_page_rows);
 $this ->limit=$this->set_limit();
 }
 private function set_limit() {
 return "limit ".($this->page-1)*$this->per_page_rows.",{ $this->per_page_rows}";
 }
 private function get_uri($url_args) {
 $url=$_SERVER["REQUEST_URI"].(strpos($_SERVER["REQUEST_URI"],"?") ? "" : "?").$url_args;
 $parse=parse_url($url);
 if (isset($parse['query'])) {
 parse_str($parse['query'],$params);/ /Parse the url string into an array
 unset($params['page']);//Delete the value whose subscript is page in the array
 $url=$parse['path'].'?'.http_build_query($params );//Build the url again
 }
 return $url;
 }
 public function __get($args) {
 if ($args=="limit") {
 return $this->limit;
 }else{
 return null;
 }
 }
 private function start_page(){
 if ($this->total_rows==0) ​​{
 return 0;
 }else{
 return (($this->page-1) *$this->per_page_rows)+1;
 }
 }
 private function end_page(){
 return min($this->page*$this->per_page_rows,$this->total_rows);
 }
 private function go_first() {
 $html="";
 if ($this->page==1) {
 $html.=" {$this->config['first']}  ;";
 }else{
 $html.=" {$this->config['first']}< /a> ";
 $html.=" {$this->config['prev']} ";
 }
 return $html;
 }
 private function go_next() {
 $ html="";
 if ($this->page==$this->total_pages) {
 $html.=" {$this->config['next']} ";
 }else{
 $html.=" {$this->config['next ']} ";
 }
 return $html;
 }
 private function go_last() {
 $html="";
 if ($this->page==$this-> ;total_pages) {
 $html.=" {$this->config['last']} ";
 }else{
 $html.=" {$this->config['last']} ";
 }
 return $html;
 }
 private function go_page() {
 return '  ' ;
 }
 private function page_list() {
 $link_page="";
 $i_num=floor($this->list_length/2);
 for ($i = $i_num; $i >= 1; $ i--) {
 $page=$this->page-$i;
 if ($page<1) {
 continue;
 }else{
 $link_page.=" {$page} ";
 }
			}
			$link_page.=" {$this->page} ";
			for ($i = 1; $i < $i_num; $i++) {
				$page=$this->page+$i;
				if ($page<=$this->total_pages) {
					$link_page.=" {$page} ";
				}else{
					break;
				}
			}
			return $link_page;
		}
		public function out_page($display=array(0,1,2,3,4,5,6,7,8)) {
			$display_html='';
			$html[0]=" 共有{$this->total_rows}{$this->config['header']} ";
			$html[1]=" 每页显示".($this->end_page()-$this->start_page()+1)."条,本页显示从{$this->start_page()}--{$this->end_page()}{$this->config['header']} ";
			$html[2]=" {$this->page}/{$this->total_pages}页 ";
			$html[3]=$this->go_first();
			$html[4]=$this->go_prev();
			$html[5]=$this->page_list();
			$html[6]=$this->go_next();
			$html[7]=$this->go_last();
			$html[8]=$this->go_page();
			foreach ($display as $index){
				$display_html.=$html[$index];
			}
			return $display_html;
		}
	}
?>

page_demo.php

header("content-type:text/html;charset=utf-8");
require_once './page.class.php';
require_once '../config/config.db.php';
//数据库中的总条数:total_rows;
//每一页显示的条数:per_page_rows
	$sql="select * from cp_sd_day";
	$rt=mysql_query($sql);
	$total_rows=mysql_num_rows($rt);
	$per_page_rows=10;

	$page=new Page($total_rows,$per_page_rows);
	$sql="select * from cp_sd_day {$page->limit}";
	$rt=mysql_query($sql);
	echo '';	echo '';	while (!!$row=mysql_fetch_assoc($rt)) {		echo '';			echo '';			echo '';			echo '';			echo '';			echo '';		echo '';	}	echo '';	echo '
cp_sd_day


'.$row['date_no'].'
'.$row['max_notwin'].'
'.$row['sum_last_miss'].'
'.$row['last_miss'].'
'.$row['last_miss_sort'].'


'.$page->out_page(array(2,3,4,5,6,7,8)).'
';
?>