长文章分页类 PHP

<?php
/*  
*   长文章分页类  
*/  
!defined('IN_MUDDER') && exit('Access Denied');
     class cutpage{    
         var $pagestr;       //被切分的内容    
         var $pagearr;       //被切分文字的数组格式    
         var $sum_word;       //总字数(UTF-8格式的中文字符也包括)    
         var $sum_page;       //总页数    
         var $page_word;     //一页多少字    
         var $cut_tag;       //自动分页符    
         var $cut_custom;     //手动分页符    
         var $ipage;         //当前切分的页数，第几页    
         var $url;    
         
         function __construct(){   
             $this->page_word = 3000;   
             $this->cut_tag = array("</table>", "</div>", "</p>", "<br/>", "”。", "。", ".", "！", "……", "？", ",");   
             $this->cut_custom = "{nextpage}";   
             $tmp_page = intval(trim($_GET["ipage"]));   
             $this->ipage = $tmp_page>1?$tmp_page:1;   
         }   
         //统计总字数   
         function get_page_word(){   
             $this->sum_word = $this->strlen_utf8($this->pagestr);   
             return $this->sum_word;   
         }   
         /*   统计UTF-8编码的字符长度 
         *   一个中文，一个英文都为一个字 
         */ 
         function strlen_utf8($str){   
           $i = 0;   
           $count = 0;   
           $len = strlen ($str);   
           while ($i < $len){   
               $chr = ord ($str[$i]);   
               $count++;   
               $i++;   
               if ($i >= $len)   
                   break;   
               if ($chr & 0x80){   
                   $chr <<= 1;   
                   while ($chr & 0x80) {   
                       $i++;   
                       $chr <<= 1;   
                   }   
               }   
           }   
           return $count;   
         }   
         //设置自动分页符号   
         function set_cut_tag($tag_arr=array()){   
             $this->cut_tag = $tag_arr;   
         }   
         //设置手动分页符   
         function set_cut_custom($cut_str){   
             $this->cut_custom = $cut_str;   
         }   
         function show_cpage($ipage=0){   
             $this->cut_str();   
             $ipage = $ipage ? $ipage:$this->ipage;   
             return $this->pagearr[$ipage];   
         }   
         function cut_str(){   
             $str_len_word = strlen($this->pagestr);     //获取使用strlen得到的字符总数   
             $i = 0;   
             if ($str_len_word<=$this->page_word){   //如果总字数小于一页显示字数
                if (strpos($this->pagestr, $this->cut_custom)){   
                     $page_arr = explode($this->cut_custom, $this->pagestr);   
                 }else{   
                 $page_arr[$i] = $this->pagestr;
                 }   
             }else{   
                 if (strpos($this->pagestr, $this->cut_custom)){   
                     $page_arr = explode($this->cut_custom, $this->pagestr);   
                 }else{   
                     $str_first = substr($this->pagestr, 0, $this->page_word);   //0-page_word个文字     cutStr为func.global中的函数   
                     foreach ($this->cut_tag as $v){   
                         $cut_start = strrpos($str_first, $v);       //逆向查找第一个分页符的位置   
                         if ($cut_start){   
                             $page_arr[$i++] = substr($this->pagestr, 0, $cut_start).$v;   
                             $cut_start = $cut_start + strlen($v);   
                             break;   
                         }   
                     }   
                     if (($cut_start+$this->page_word)>=$str_len_word){   //如果超过总字数   
                         $page_arr[$i++] = substr($this->pagestr, $cut_start, $this->page_word);   
                     }else{   
                         while (($cut_start+$this->page_word)<$str_len_word){   
                             foreach ($this->cut_tag as $v){   
                                 $str_tmp = substr($this->pagestr, $cut_start, $this->page_word);         //取第cut_start个字后的page_word个字符   
                                 $cut_tmp = strrpos($str_tmp, $v);       //找出从第cut_start个字之后，page_word个字之间，逆向查找第一个分页符的位置   
                                 if ($cut_tmp){   
                                     $page_arr[$i++] = substr($str_tmp, 0, $cut_tmp).$v;   
                                     $cut_start = $cut_start + $cut_tmp + strlen($v);   
                                     break;   
                                 }   
                             }     
                         }   
                         if (($cut_start+$this->page_word)>$str_len_word){   
                             $page_arr[$i++] = substr($this->pagestr, $cut_start, $this->page_word);   
                         }   
                     }   
                 }   
             }   
             $this->sum_page = count($page_arr);     //总页数   
             $this->pagearr = $page_arr;   
         }   
         //显示上一条，下一条   
         function show_prv_next(){   
             $this->set_url();   
             if ($this->sum_page>1 and $this->ipage<$this->sum_page){   
                 $str = "<a href='".$this->url.($this->ipage+1)."'><b>下一页</b>& lt;/a>　";
                 $str .= $this->show_page_select();   
             }else{
                $str= "<font color='gray'>下一页</font>";
                $str .= $this->show_page_select();
             }   
             if ($this->sum_page>1 and $this->ipage>1){   
                 $str.= "<a href='".$this->url.($this->ipage-1)."'><b>上一页</b>& lt;/a>";   
             }else{
                $str.= "<font color='gray'>上一页</font>";
             }   
             return $str;   
         }   
         function show_page_select(){   
             if ($this->sum_page>1){   
                 $str .= "   <select nchange=\"location.href=this.options[this.selectedIndex].value\">";   
                 for ($i=1; $i<=$this->sum_page; $i++){   
                     $str.= "<option value='".$this->url.$i."' ".(($this->ipage)==$i ? " selected='selected'":"").">第".$i."页</option>";   
                 }   
                 $str.= "</select>";   
             }   
             return $str;   
         }   
         function show_page_select_wap(){   
             if ($this->sum_page>1){   
                 $str = "<select ivalue='".($this->ipage-1)."'>";   
                 for ($i=1; $i<=$this->sum_page; $i++){   
                     $str.= "<option npick='".$this->url.$i."'>第".$i."节</option>";   
                 }   
                 $str.= "</select>";   
             }   
             return $str;   
         }   
         function set_url(){   
             parse_str($_SERVER["QUERY_STRING"], $arr_url);   
             unset($arr_url["ipage"]);   
             if (empty($arr_url)){   
                 $str = "ipage=";   
             }else{   
                 $str = http_build_query($arr_url)."&ipage=";   
             }   
             $this->url = "http://".$_SERVER["HTTP_HOST"].$_SERVER["PHP_SELF"]."?".$str;   
         }   
     }
    
     
?>


//文章分页
$article_content = $article['content'];   
$ipage = $_GET["ipage"]? intval($_GET["ipage"]):1;   
$CP = new cutpage();
$CP->pagestr = $article_content;   
$CP->cut_str();
$currentpage = $CP->pagearr[$ipage-1];  
$pre_next_page = $CP->show_prv_next();
$page_number = $CP->show_page_select_wap();
$select_page_number = $CP->show_page_select();