php分页类

<?php
class Page {
private $total; //总记录
private $pagesize; //每页显示多少条
private $limit; //limit
private $page; //当前页码
private $pagenum; //总页码
private $url; //地址
private $bothnum; //两边保持数字分页的量

//构造方法初始化
public function __construct($_total, $_pagesize) {
$this->total = $_total ? $_total : 1;
$this->pagesize = $_pagesize;
$this->pagenum = ceil($this->total / $this->pagesize);
$this->page = $this->setPage();
$this->limit = "LIMIT ".($this->page-1)*$this->pagesize.",$this->pagesize";
$this->url = $this->setUrl();
$this->bothnum = 2;
}

//拦截器
public function __get($_key) {
return $this->$_key;
}

//获取当前页码
private function setPage() {
if (!empty($_GET['page'])) {
if ($_GET['page'] > 0) {
if ($_GET['page'] > $this->pagenum) {
return $this->pagenum;
} else {
return $_GET['page'];
}
} else {
return 1;
}
} else {
return 1;
}
}

//获取地址
private function setUrl() {
$_url = $_SERVER["REQUEST_URI"];
$_par = parse_url($_url);
if (isset($_par['query'])) {
parse_str($_par['query'],$_query);
unset($_query['page']);
$_url = $_par['path'].'?'.http_build_query($_query);
}
return $_url;
} //数字目录
private function pageList() {
$_pagelist="";
for ($i=$this->bothnum;$i>=1;$i--) {
$_page = $this->page-$i;
if ($_page < 1) continue;
$_pagelist .= ' <a href="'.$this->url.'&page='.$_page.'">'.$_page.'</a> ';
}
$_pagelist .= ' <span class="me">'.$this->page.'</span> ';
for ($i=1;$i<=$this->bothnum;$i++) {
$_page = $this->page+$i;
if ($_page > $this->pagenum) break;
$_pagelist .= ' <a href="'.$this->url.'&page='.$_page.'">'.$_page.'</a> ';
}
return $_pagelist;
}

//首页
private function first() {
if ($this->page > $this->bothnum+1) {
return ' <a href="'.$this->url.'">1</a> ...';
}
}

//上一页
private function prev() {
if ($this->page == 1) {
return '<span class="disabled">上一页</span>';
}
return ' <a href="'.$this->url.'&page='.($this->page-1).'">上一页</a> ';
}

//下一页
private function next() {
if ($this->page == $this->pagenum) {
return '<span class="disabled">下一页</span>';
}
return ' <a href="'.$this->url.'?page='.($this->page+1).'">下一页</a> ';
}

//尾页
private function last() {
if ($this->pagenum - $this->page > $this->bothnum) {
return ' ...<a href="'.$this->url.'&page='.$this->pagenum.'">'.$this->pagenum.'</a> ';
}
}

//分页信息
public function showpage() {
$_page="";
$_page .= $this->first();
$_page .= $this->pageList();
$_page .= $this->last();
$_page .= $this->prev();
$_page .= $this->next();
return $_page;
}
}
?>
<?php
$_page = new Page(23,4); //其中 $_total 是数据集的总条数,$_pagesize 是每页显示的数量.
echo $_page->showpage();
?>