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写好的类怎么使用呢？

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Jun 06, 2016 pm 08:15 PM

php

这个分页类不是我写的我在网上看的可是我不知道实际使用时是怎么用的？在我看到这个类的地方只有一个这个类没有例子我是新手算是基本能看懂吧这个看懂仅仅是在这个类里面看懂之前没有接触过面向对象连类在实际中使用的都不知道比如这个使用这个类传时给构造函数传两个参数就行了吗连接数据库那些东西怎么没有呢那怎么连接数据库呢？那些该写到哪里呢？

<code><?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  
      private 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 $_url;  
      }     //数字目录  
      private function pageList() {  
         for ($i=$this->bothnum;$i>=1;$i--) {  
            $_page = $this->page-$i;  
            if ($_page url.'&page='.$_page.'">'.$_page.' ';  
         }  
         $_pagelist .= ' <span class="me">'.$this->page.'</span> ';  
         for ($i=1;$ibothnum;$i++) {  
            $_page = $this->page+$i;  
                if ($_page > $this->pagenum) break;  
                $_pagelist .= ' <a href="'.%24this->url.'&page='.%24_page.'">'.$_page.'</a> ';  
         }  
         return $_pagelist;  
      }  
    
      //首页  
      private function first() {  
         if ($this->page > $this->bothnum+1) {  
                return ' <a href="'.%24this->url.'">1</a> ...';  
         }  
      }  
    
      //上一页  
      private function prev() {  
         if ($this->page == 1) {  
                return '<span class="disabled">上一页</span>';  
         }  
         return ' <a href="'.%24this->url.'&page='.(%24this->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="'.%24this->url.'&page='.(%24this->page+1).'">下一页</a> ';  
      }  
    
      //尾页  
      private function last() {  
         if ($this->pagenum - $this->page > $this->bothnum) {  
                return ' ...<a href="'.%24this->url.'&page='.%24this->pagenum.'">'.$this->pagenum.'</a> ';  
         }  
      }  
    
      //分页信息  
      public function showpage() {  
         $_page .= $this->first();  
         $_page .= $this->pageList();  
         $_page .= $this->last();  
         $_page .= $this->prev();  
         $_page .= $this->next();  
         return $_page;  
      }  
 }  
?>  </code>

回复内容：

<code><?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  
      private 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 $_url;  
      }     //数字目录  
      private function pageList() {  
         for ($i=$this->bothnum;$i>=1;$i--) {  
            $_page = $this->page-$i;  
            if ($_page url.'&page='.$_page.'">'.$_page.' ';  
         }  
         $_pagelist .= ' <span class="me">'.$this->page.'</span> ';  
         for ($i=1;$ibothnum;$i++) {  
            $_page = $this->page+$i;  
                if ($_page > $this->pagenum) break;  
                $_pagelist .= ' <a href="'.%24this->url.'&page='.%24_page.'">'.$_page.'</a> ';  
         }  
         return $_pagelist;  
      }  
    
      //首页  
      private function first() {  
         if ($this->page > $this->bothnum+1) {  
                return ' <a href="'.%24this->url.'">1</a> ...';  
         }  
      }  
    
      //上一页  
      private function prev() {  
         if ($this->page == 1) {  
                return '<span class="disabled">上一页</span>';  
         }  
         return ' <a href="'.%24this->url.'&page='.(%24this->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="'.%24this->url.'&page='.(%24this->page+1).'">下一页</a> ';  
      }  
    
      //尾页  
      private function last() {  
         if ($this->pagenum - $this->page > $this->bothnum) {  
                return ' ...<a href="'.%24this->url.'&page='.%24this->pagenum.'">'.$this->pagenum.'</a> ';  
         }  
      }  
    
      //分页信息  
      public function showpage() {  
         $_page .= $this->first();  
         $_page .= $this->pageList();  
         $_page .= $this->last();  
         $_page .= $this->prev();  
         $_page .= $this->next();  
         return $_page;  
      }  
 }  
?>  </code>

它只是一个分页类啊，你可以理解成给一个数组分页，就这么简单。如果耦合数据库的东西就太复杂了。

直接include就可以用了

首先这是一个类包含一些方法和属性，作用是用来「分页」，实例化后使用。
另外所谓「分页类」的主要作用无非是计算一个查询sql中limit，然后计算该显示多少页什么的，很简单，仔细看看内几个方法就明白了。
最后，这东西多了不说十年八年的历史是有了，新学的话别管这些东西了，从新的开始，多理解基础，可以看看《php: the right way》也叫「php之道」还是什么的，跟上时代的脚步哈哈

手机随便写了点，希望能有点儿帮助。

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