index.php
<?php
require_once 'page.php';
require_once '../PDO/index2.php';
$config = ['host'=>'localhost','dbname'=>'gaokao','user'=>'root','password'=>'root'];
$db1 = Db::getInstance($config);
$field = ['name','pwd','fee'];
?>
<!DOCTYPE html>
<html>
<head>
<meta charset = "utf-8">
<title>分页类</title>
</head>
<body>
<?php
//$total = 300;
$total = $db1->getCount('user',$field,'id>=1');
$size = 2;//每页显示的条数
$cur = isset($_GET['page'])?$_GET['page']:1;
$from = ($cur-1) * $size;
$result = $db1->getAll('user',$field,'id>=1',$from,$size);
foreach($result as $v){
echo "<li>$v[name]</li>";
}
$page = new Page($total,$size,$cur);
echo $page->showPage();
?>
</body>
</html>
page.php
<?php
Class Page{
private $total;//总共显示的条数
private $size;//每页显示的条数
private $pageCount;//总的页数
private $cur;
private $showPages = 2;//显示的页数
private $pageStart;
private $pageEnd;
public function __construct($total,$size,$cur){
$this->total = $total;
$this->size = $size;
$this->pageCount = ceil($total / $size);
$this->cur = $cur;
$this->pageStart = ($this->cur - $this->showPages);
//start 0 cur 2 end 5 应该是 end+(1-start)
//strat -2 cur 1 end 4 应该是 7 end + (1-start)
//start 1 cur 4 end 7
$this->pageEnd = ($this->cur + $this->showPages);
//end = 13 cur 11 start 8 应该是7
//end = 13 cur 12 start 9 应该是7
//end = 13 cur 13 start 10 应该是 7
if($this->pageStart > $this->pageCount - 2*$this->showPages ){
$this->pageStart = $this->pageCount - 2*$this->showPages;
}
if($this->pageStart <=0){
$this->pageEnd = $this->pageEnd + (1-$this->pageStart);
$this->pageStart = 1;
}
if($this->pageEnd > $this->pageCount){
$this->pageEnd = $this->pageCount;
}
}
public function showPage(){
if($this->total > $this->size){
$str = '<div id=page>';
$str .= $this->homePage();
$str .= $this->prePage();
$str .= $this->midPage();
$str .= $this->nextPage();
$str .= $this->lastPage();
$str .= $this->showTotal();
$str .= '</div>';
}else{
$str='';
}
return $str;
}
//首页
private function homePage(){
if($this->cur ==1){
return '<p>首页</p>';
}else{
return '<a href=?page=1>首页</a>';
}
}
//上一页
private function prePage(){
if($this->cur == 1){
return '<p>上一页</p>';
}else{
$pre = $this->cur -1;
return "<a href=?page=$pre>上一页</a>";
}
}
//中间的页码
private function midPage(){
$str = '';
if($this->pageStart != 1){
$str .= '...';
}
for($i=$this->pageStart;$i<=$this->pageEnd;$i++){
if($this->cur == $i){
$str.="<a class=$this->cur href=?page=$i> $i </a>";
}else{
$str.="<a href=?page=$i> $i </a>";
}
}
if($this->pageEnd != $this->pageCount){
$str.='...';
}
return $str;
}
private function nextPage(){
if($this->cur == $this->pageCount){
return '<p>下一页</p>';
}else{
$next = $this->cur +1;
return "<a href=?page=$next>下一页</a>";
}
}
private function lastPage(){
if($this->cur == $this->pageCount){
return '<p>尾页</p>';
}else{
$next = $this->cur +1;
return "<a href=?page=$this->pageCount>尾页</a>";
}
}
private function showTotal(){
return "<p>共<b>$this->pageCount</b>页 共<b>$this->total</b>条数据</p>";
}
}
?>
