tp5框架内使用tp3.2分页的方法分析

<?php
namespace org;//命名规范
class Page{
public $firstRow; // 起始行数
public $listRows; // 列表每页显示行数
public $parameter; // 分页跳转时要带的参数
public $totalRows; // 总行数
public $totalPages; // 分页总页面数
public $rollPage  = 7;// 分页栏每页显示的页数
public $lastSuffix = false; // 最后一页是否显示总页数
private $p    = 'p'; //分页参数名
private $url   = ''; //当前链接URL
private $nowPage = 1;
// 分页显示定制
private $config = array(
'header' =  '<span class="rows" 共 %TOTAL_ROW% 条记录</span ',
'prev'  =  '<<',
'next'  =  '  ',
'first' =  '1...',
'last'  =  '...%TOTAL_PAGE%',
'theme' =  '%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END%',
);
/**
* 架构函数
* @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=20, $parameter = array()) {
config('var_page') && $this- p = config('var_page'); //设置分页参数名称
/* 基础设置 */
$this- totalRows = $totalRows; //设置总记录数
$this- listRows  = $listRows; //设置每页显示行数
$this- parameter = empty($parameter) ? input('param.'):$parameter;//因为tp5无法直接获取到$_GET,所以这里直接拿tp5的函数input('param.'),下面的一样
$this- nowPage  = empty(input('param.p')) ? 1 : intval(input('param.p'));
$this- nowPage  = $this- nowPage 0 ? $this- nowPage : 1;
$this- firstRow  = $this- listRows * ($this- nowPage - 1);
}
/**
* 定制分页链接设置
* @param string $name 设置名称
* @param string $value 设置值
*/
public function setConfig($name,$value) {
if(isset($this- config[$name])) {
$this- config[$name] = $value;
}
}
/**
* 生成链接URL
* @param integer $page 页码
* @return string
*/
private function url($page){
$ispage = str_replace(urlencode('[PAGE]'), $page, $this- url);
return $ispage;
}
/**
* 组装分页链接
* @return string
*/
public function show() {
if(0 == $this- totalRows) return '';
/* 生成URL */
$this- parameter[$this- p] = '[PAGE]';
$this- url = url(request()- action(), $this- parameter);//生成url改成tp5获取当前action的
/* 计算分页信息 */
$this- totalPages = ceil($this- totalRows / $this- listRows); //总页数
if(!empty($this- totalPages) && $this- nowPage   $this- totalPages) {
$this- nowPage = $this- totalPages;
}
/* 计算分页临时变量 */
$now_cool_page   = $this- rollPage/2;
$now_cool_page_ceil = ceil($now_cool_page);
$this- lastSuffix && $this- config['last'] = $this- totalPages;
//上一页
$up_row = $this- nowPage - 1;
$up_page = $up_row   0 ? '<a class="prev" href="' . $this- url($up_row) . '" rel="external nofollow"  ' . $this- config['prev'] . '</a ' : '';
//下一页
$down_row = $this- nowPage + 1;
$down_page = ($down_row <= $this- totalPages) ? '<a class="next" href="' . $this- url($down_row) . '" rel="external nofollow"  ' . $this- config['next'] . '</a ' : '';
//第一页
$the_first = '';
if($this- totalPages   $this- rollPage && ($this- nowPage - $now_cool_page)  = 1){
$the_first = '<a class="first" href="' . $this- url(1) . '" rel="external nofollow"  ' . $this- config['first'] . '</a ';
}
//最后一页
$the_end = '';
if($this- totalPages   $this- rollPage && ($this- nowPage + $now_cool_page) < $this- totalPages){
$the_end = '<a class="end" href="' . $this- url($this- totalPages) . '" rel="external nofollow"  ' . $this- config['last'] . '</a ';
}
//数字连接
$link_page = "";
for($i = 1; $i <= $this- rollPage; $i++){
if(($this- nowPage - $now_cool_page) <= 0 ){
$page = $i;
}elseif(($this- nowPage + $now_cool_page - 1)  = $this- totalPages){
$page = $this- totalPages - $this- rollPage + $i;
}else{
$page = $this- nowPage - $now_cool_page_ceil + $i;
}
if($page   0 && $page != $this- nowPage){
if($page <= $this- totalPages){
$link_page .= '<a class="num" href="' . $this- url($page) . '" rel="external nofollow"  ' . $page . '</a ';
}else{
break;
}
}else{
if($page   0 && $this- totalPages != 1){
$link_page .= '<span class="current" ' . $page . '</span ';
}
}
}
//替换分页内容
$page_str = str_replace(
array('%HEADER%', '%NOW_PAGE%', '%UP_PAGE%', '%DOWN_PAGE%', '%FIRST%', '%LINK_PAGE%', '%END%', '%TOTAL_ROW%', '%TOTAL_PAGE%'),
array($this- config['header'], $this- nowPage, $up_page, $down_page, $the_first, $link_page, $the_end, $this- totalRows, $this- totalPages),
$this- config['theme']);
return "<div {$page_str}</div ";
}
}