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php类 文章内容分页

<?php
/**
 * @Author: Eric-枫
 * @Date:   2019-11-26 09:59:06
 * @Last Modified by:   Eric-枫
 * @Last Modified time: 2019-11-26 10:11:33
 *
use zf\Cutpage;
$_temp_content = $content['content'];     
$ipage = isset($_GET["ipage"])? intval($_GET["ipage"]):1;    
$CP = new cutpage($_temp_content); 
$page = $CP->cut_str();   
echo $page[$ipage-1];    
echo $CP->pagenav(); 
die;
 * 
 */
namespace zf;
/*   
*  长文章分页类      
*/   
class Cutpage{     
    private $pagestr;       //被切分的内容     
    private $pagearr;       //被切分文字的数组格式     
    private $sum_word;      //总字数(UTF-8格式的中文字符也包括)     
    private $sum_page;      //总页数     
    private $page_word;     //一页多少字     
    private $cut_tag;       //自动分页符     
    private $cut_custom;    //手动分页符     
    private $ipage;         //当前切分的页数,第几页     
    private $url;     

    function __construct($pagestr,$page_word=2000){     
        $this->page_word = $page_word;     
        $this->cut_tag = array("</table>", "</div>", "</p>", "<br/>", "”。", "。", ".", "!", "……", "?", ",");     
        $this->cut_custom = "{nextpage}";     
        // $tmp_page = intval(trim($_GET["ipage"]));  
        $tmp_page = isset($_GET["ipage"])? intval($_GET["ipage"]):1;    
        $this->ipage = $tmp_page>1?$tmp_page:1;  
        $this->pagestr = $pagestr; 
    }     

    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     
            $page_arr[$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;   
        return $page_arr; 
    }     
    //显示上一条,下一条     
    function pagenav(){     
        $this->set_url();     
        $str = ''; 

        //$str .= $this->ipage.'/'.$this->sum_page; 

        for($i=1;$i<=$this->sum_page;$i++){ 
            if($i==$this->ipage) { 
                $str.= "<a href='#' class='cur'>".$i."</a> "; 
            }else{ 
                $str.= "<a href='".$this->url.$i."'>".$i."</a> "; 
            } 
        } 


        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;     
    }     
}     
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