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How to achieve perfect paging in php

一个新手
Release: 2023-03-16 18:56:01
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<?php
    /**
        file: page.class.php 
        完美分页类 Page 
    */
    class Page {
        private $total;                            //数据表中总记录数
        private $listRows;                         //每页显示行数
        private $limit;                            //SQL语句使用limit从句,限制获取记录个数
        private $uri;                              //自动获取url的请求地址
        private $pageNum;                          //总页数
        private $page;                            //当前页    
        private $config = array(
                &#39;head&#39; => "条记录", 
                &#39;prev&#39; => "上一页", 
                &#39;next&#39; => "下一页", 
                &#39;first&#39;=> "首页", 
                &#39;last&#39; => "末页"
            );                     
        //在分页信息中显示内容,可以自己通过set()方法设置
        private $listNum = 10;                     //默认分页列表显示的个数
        /**
            构造方法,可以设置分页类的属性
            @param    int    $total        计算分页的总记录数
            @param    int    $listRows    可选的,设置每页需要显示的记录数,默认为25条
            @param    mixed    $query    可选的,为向目标页面传递参数,可以是数组,也可以是查询字符串格式
            @param     bool    $ord    可选的,默认值为true, 页面从第一页开始显示,false则为最后一页
         */
        public function __construct($total, $listRows=25, $query="", $ord=true){
            $this->total = $total;
            $this->listRows = $listRows;
            $this->uri = $this->getUri($query);
            $this->pageNum = ceil($this->total / $this->listRows);
            /*以下判断用来设置当前面*/
            if(!empty($_GET["page"])) {
                $page = $_GET["page"];
            }else{
                if($ord)
                    $page = 1;
                else
                    $page = $this->pageNum;
            }
            if($total > 0) {
                if(preg_match(&#39;/\D/&#39;, $page) ){
                    $this->page = 1;
                }else{
                    $this->page = $page;
                }
            }else{
                $this->page = 0;
            }
            
            $this->limit = "LIMIT ".$this->setLimit();
        }
        /**
            用于设置显示分页的信息,可以进行连贯操作
            @param    string    $param    是成员属性数组config的下标
            @param    string    $value    用于设置config下标对应的元素值
            @return    object            返回本对象自己$this, 用于连惯操作
         */
        function set($param, $value){
            if(array_key_exists($param, $this->config)){
                $this->config[$param] = $value;
            }
            return $this;
        }
        
        /* 不是直接去调用,通过该方法,可以使用在对象外部直接获取私有成员属性limit和page的值 */
        function __get($args){
            if($args == "limit" || $args == "page")
                return $this->$args;
            else
                return null;
        }
        
        /**
            按指定的格式输出分页
            @param    int    0-7的数字分别作为参数,用于自定义输出分页结构和调整结构的顺序,默认输出全部结构
            @return    string    分页信息内容
         */
        function fpage(){
            $arr = func_get_args();
            $html[0] = "<span class=&#39;p1&#39;> 共<b> {$this->total} </b>{$this->config["head"]} </span>";
            $html[1] = " 本页 <b>".$this->disnum()."</b> 条 ";
            $html[2] = " 本页从 <b>{$this->start()}-{$this->end()}</b> 条 ";
            $html[3] = " <b>{$this->page}/{$this->pageNum}</b>页 ";
            $html[4] = $this->firstprev();
            $html[5] = $this->pageList();
            $html[6] = $this->nextlast();
            $html[7] = $this->goPage();
            
            $fpage = &#39;<div style="font:12px \&#39;\5B8B\4F53\&#39;,san-serif;">&#39;;
            if(count($arr) < 1)
                $arr = array(0, 1,2,3,4,5,6,7);
            
            for($i = 0; $i < count($arr); $i++)
                $fpage .= $html[$arr[$i]];
        
            $fpage .= &#39;</div>&#39;;
            return $fpage;
        }
        
        /* 在对象内部使用的私有方法,*/
        private function setLimit(){
            if($this->page > 0)
                return ($this->page-1)*$this->listRows.", {$this->listRows}";
            else
                return 0;
        }
        /* 在对象内部使用的私有方法,用于自动获取访问的当前URL */
        private function getUri($query){    
            $request_uri = $_SERVER["REQUEST_URI"];    
            $url = strstr($request_uri,&#39;?&#39;) ? $request_uri :  $request_uri.&#39;?&#39;;
            
            if(is_array($query))
                $url .= http_build_query($query);
            else if($query != "")
                $url .= "&".trim($query, "?&");
        
            $arr = parse_url($url);
            if(isset($arr["query"])){
                parse_str($arr["query"], $arrs);
                unset($arrs["page"]);
                $url = $arr["path"].&#39;?&#39;.http_build_query($arrs);
            }
            
            if(strstr($url, &#39;?&#39;)) {
                if(substr($url, -1)!=&#39;?&#39;)
                    $url = $url.&#39;&&#39;;
            }else{
                $url = $url.&#39;?&#39;;
            }
            
            return $url;
        }
        /* 在对象内部使用的私有方法,用于获取当前页开始的记录数 */
        private function start(){
            if($this->total == 0)
                return 0;
            else
                return ($this->page-1) * $this->listRows+1;
        }
        /* 在对象内部使用的私有方法,用于获取当前页结束的记录数 */
        private function end(){
            return min($this->page * $this->listRows, $this->total);
        }
        /* 在对象内部使用的私有方法,用于获取上一页和首页的操作信息 */
        private function firstprev(){
            if($this->page > 1) {
                $str = " <a href=&#39;{$this->uri}page=1&#39;>{$this->config["first"]}</a> ";
                $str .= "<a href=&#39;{$this->uri}page=".($this->page-1)."&#39;>{$this->config["prev"]}</a> ";        
                return $str;
            }
        }
    
        /* 在对象内部使用的私有方法,用于获取页数列表信息 */
        private function pageList(){
            $linkPage = " <b>";
            
            $inum = floor($this->listNum/2);
            /*当前页前面的列表 */
            for($i = $inum; $i >= 1; $i--){
                $page = $this->page-$i;
                if($page >= 1)
                    $linkPage .= "<a href=&#39;{$this->uri}page={$page}&#39;>{$page}</a> ";
            }
            /*当前页的信息 */
            if($this->pageNum > 1)
                $linkPage .= "<span style=&#39;padding:1px 2px;background:#BBB;color:white&#39;>{$this->page}</span> ";
            
            /*当前页后面的列表 */
            for($i=1; $i <= $inum; $i++){
                $page = $this->page+$i;
                if($page <= $this->pageNum)
                    $linkPage .= "<a href=&#39;{$this->uri}page={$page}&#39;>{$page}</a> ";
                else
                    break;
            }
            $linkPage .= &#39;</b>&#39;;
            return $linkPage;
        }
        /* 在对象内部使用的私有方法,获取下一页和尾页的操作信息 */
        private function nextlast(){
            if($this->page != $this->pageNum) {
                $str = " <a href=&#39;{$this->uri}page=".($this->page+1)."&#39;>{$this->config["next"]}</a> ";
                $str .= " <a href=&#39;{$this->uri}page=".($this->pageNum)."&#39;>{$this->config["last"]}</a> ";
                return $str;
            }
        }
        /* 在对象内部使用的私有方法,用于显示和处理表单跳转页面 */
        private function goPage(){
                if($this->pageNum > 1) {
                return &#39; <input style="width:20px;height:17px !important;height:18px;border:1px solid #CCCCCC;" type="text" onkeydown="javascript:if(event.keyCode==13){var page=(this.value>&#39;.$this->pageNum.&#39;)?&#39;.$this->pageNum.&#39;:this.value;location=\&#39;&#39;.$this->uri.&#39;page=\&#39;+page+\&#39;\&#39;}" value="&#39;.$this->page.&#39;"><input style="cursor:pointer;width:25px;height:18px;border:1px solid #CCCCCC;" type="button" value="GO" onclick="javascript:var page=(this.previousSibling.value>&#39;.$this->pageNum.&#39;)?&#39;.$this->pageNum.&#39;:this.previousSibling.value;location=\&#39;&#39;.$this->uri.&#39;page=\&#39;+page+\&#39;\&#39;"> &#39;;
            }
        }
        /* 在对象内部使用的私有方法,用于获取本页显示的记录条数 */
        private function disnum(){
            if($this->total > 0){
                return $this->end()-$this->start()+1;
            }else{
                return 0;
            }
        }
    }
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