php对内容较长的文章进行分页

时间：2022-06-24 22:44:36 编辑：袖梨来源：一聚教程网

require "page.class.php";
$neirong = "内容内容内容内容内容内容内容内容内容内容内容内容内容内容";
$content = file_get_contents($neirong);
$ipage = isset($_GET["ipage"]) ? intval($_GET["ipage"]) : 1;
$CP = new cutpage($content);
$page = $CP->cut_str();
echo $page[$ipage - 1];
echo '' . $CP->pagenav() . '';

class类

page.class.php

/*
* 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=1000){
            $this->page_word = $page_word;
            $this->cut_tag = array("", "

", "

", "
", "”。", "。", ".", "！", "……", "？", ",");
            $this->cut_custom = "{nextpage}";
            $tmp_page = isset($_GET["ipage"]) ? intval($_GET["ipage"]) : 1;
            $this->ipage = $tmp_page>1?$tmp_page:1;
            $this->pagestr = $pagestr;
        }
        //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
                $page_arr[$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) {
                    $str.= "".$i." ";
                }else{
                    $str.= "".$i." ";
                }
            }


            return $str;
        }
        function show_prv_next2(){
            $this->set_url();
            $str = '';



            if ($this->sum_page>1 and $this->ipage>1){
                $str.= "上一页 ";
            }
            if ($this->sum_page>1 and $this->ipage<$this->sum_page){
                $str .= "下一页";
            }
            return $str;
        }
        function show_page_select(){
            if ($this->sum_page>1){
                $str = "   ";
            }
            return $str;
        }
        function show_page_select_wap(){
            if ($this->sum_page>1){
                $str = "";
            }
            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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