如何编写一个简单且很好用的php分页类
复制代码 代码如下:
class Page {
// 分页栏每页显示的页数
public $rollPage = 6;
// 页数跳转时要带的参数
public $parameter ;
// 默认列表每页显示行数
public $listRows = 20;
// 起始行数
public $firstRow ;
// 分页总页面数
protected $totalPages ;
// 总行数
protected $totalRows ;
// 当前页数
protected $nowPage ;
// 分页的栏的总页数
protected $coolPages ;
// 分页显示定制
protected $config = array(
'redirect'=>false,
'header'=>'条记录',
'prev'=>'上一页',
'next'=>'下一页',
'first'=>'1',
'last'=>'最后一页',
'theme'=>'
// 默认分页变量名
protected $varPage;
/**
+----------------------------------------------------------
* 架构函数
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param array $totalRows 总的记录数
* @param array $listRows 每页显示记录数
* @param array $parameter 分页跳转的参数
+----------------------------------------------------------
*/
public function __construct($totalRows,$listRows='',$parameter='') {
$this->totalRows = $totalRows;
$this->parameter = $parameter;
$this->varPage = C('VAR_PAGE') ? C('VAR_PAGE') : 'p' ;
if(!empty($listRows)) {
$this->listRows = intval($listRows);
}
$this->totalPages = ceil($this->totalRows/$this->listRows); //总页数
$this->coolPages = ceil($this->totalPages/$this->rollPage);
//$_GET验证
$this->nowPage = intval($_GET[$this->varPage]);
$this->nowPage = $this->nowPage > 0 ? $this->nowPage : 1;
if(!empty($this->totalPages) && $this->nowPage>$this->totalPages) {
$this->nowPage = $this->totalPages;
}
$this->firstRow = $this->listRows*($this->nowPage-1);
}
public function setConfig($name,$value) {
if(isset($this->config[$name])) {
$this->config[$name] = $value;
}
}
/**
+----------------------------------------------------------
* 分页显示输出
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function show() {
if(0 == $this->totalRows) return '';
//处理参数
$p = $this->varPage;
$url = $_SERVER['REQUEST_URI'].(strpos($_SERVER['REQUEST_URI'],'?')?'':"?").$this->parameter;
$parse = parse_url($url);
if(isset($parse['query'])) {
parse_str($parse['query'],$params);
unset($params[$p]);
$url = $parse['path'].'?'.http_build_query($params);
}
/* 分页逻辑 */
//当总数小于显示的页码数
if ($this->totalPages <= $this->rollPage) {
$start = 1;
$end = $this->totalPages;
}
else{
//
if ($this->nowPage <= $this->rollPage - 1) {
$start = 1;
$end = $this->rollPage;
$islast = true;
}
else if ($this->nowPage > $this->totalPages - $this->rollPage + 1) {
$start = $this->totalPages - ($this->rollPage - 1);
$end = $this->totalPages;
$isfirst = true;
}
else{
//浮动数
$size = floor($this->rollPage / 2);
$start = $this->nowPage - $size;
$end = $this->nowPage + $size;
$isfirst = true;
$islast = true;
}
}
//上下翻页字符串
$upRow = $this->nowPage - 1;
$downRow = $this->nowPage + 1;
/* 拼装HTML */
//< 1... ...last >
if ($isfirst){
$theFirst = "".$this->config['first']."";
}
if ($islast){
$theEnd = "totalPages' >".$this->config['last']."";
}
if ($upRow > 0){
$upPage = "".$this->config['prev']."";
}
if ($downRow <= $this->totalPages){
$downPage = "".$this->config['next']."";
}
if($start==3){
$linkPage .= "2";
}
if($start>=4){
$linkPage .= "2 ...";
}
//1 2 3 4 5
for($i=$start;$i<=$end;$i++){
if($i!=$this->nowPage){
$linkPage .= " ".$i." ";
}else{
$linkPage .= " ".$i."";
}
if($i==$end){
if($i<$this->totalRows){
$linkPage .= " ...";
}
}
}
$pageStr = str_replace(
array('%header%','%nowPage%','%totalRow%','%totalPage%','%upPage%','%first%','%prePage%','%linkPage%','%nextPage%','%downPage%','%end%'),
array($this->config['header'],$this->nowPage,$this->totalRows,$this->totalPages,$upPage,$theFirst,$prePage,$linkPage,$nextPage,$downPage,$theEnd),$this->config['theme']);
//显示模式 普通false 带跳转ture
if (!empty($this->config['redirect'])){
$html = $pageStr;
}else{
//传递参数
if($this->totalPages > 1){
$redirect = " 到第
}else{
$redirect = $redirect . '
}
}
//生成Html字符串
$html = $pageStr . $redirect;
}
return $html;
}
}