php 長文章自動/手動分頁類

<?php

/*

* 長文章分頁類

* @package cutpage

* @author yytcpt(無影)

* @version 2008-03-27

* @copyrigth http://www.d5s.cn/

*/

class cutpage{

var $pagestr; //被切分的内容

var $pagearr; //被切分文字的數組格式

var $sum_word; //總字數(UTF-8格式的中文字元也包括)

var $sum_page; //總頁數

var $page_word; //一頁多少字

var $cut_tag; //自動分頁符

var $cut_custom; //手動分頁符

var $ipage; //目前切分的頁數，第幾頁

var $url;

function __construct(){

$this->page_word = 1000;

$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;

}

//統計總字數

function get_page_word(){

$this->sum_word = $this->strlen_utf8($this->pagestr);

return $this->sum_word;

}

/* 統計UTF-8編碼的字元長度

* 一個中文，一個英文都為一個字

*/

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;

}

//設定自動分頁符号

function set_cut_tag($tag_arr=array()){

$this->cut_tag = $tag_arr;

}

//設定手動分頁符

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); //擷取使用strlen得到的字元總數

$i = 0;

if ($str_len_word<=$this->page_word){ //如果總字數小于一頁顯示字數

$page_arr[$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個文字 cutStr為func.global中的函數

foreach ($this->cut_tag as $v){

$cut_start = strrpos($str_first, $v); //逆向查找第一個分頁符的位置

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){ //如果超過總字數

$page_arr[$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個字後的page_word個字元

$cut_tmp = strrpos($str_tmp, $v); //找出從第cut_start個字之後，page_word個字之間，逆向查找第一個分頁符的位置

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); //總頁數

$this->pagearr = $page_arr;

}

//顯示上一條，下一條

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)."'>下一頁</a>　";

}

if ($this->sum_page>1 and $this->ipage>1){

$str.= "<a href='".$this->url.($this->ipage-1)."'>上一頁</a>";

}

return $str;

}

function show_page_select(){

if ($this->sum_page>1){

$str = " <select οnchange=/"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."頁</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++){

$str.= "<option onpick='".$this->url.$i."'>第".$i."節</option>";

}

$str.= "</select>";

}

return $str;

}

function set_url(){

parse_str($_SERVER["QUERY_STRING"], $arr_url);

unset($arr_url["ipage"]);

if (emptyempty($arr_url)){

$str = "ipage=";

}else{

$str = http_build_query($arr_url)."&ipage=";

}

$this->url = "http://".$_SERVER["HTTP_HOST"].$_SERVER["PHP_SELF"]."?".$str;

}

}

?>

執行個體代碼：請以UTF-8的檔案編碼進行測試。

include('cutpage.php');

header("content-type:text/html;charset=utf-8");//設定頁面編碼

//自定義的長文章字元串，可以包含 html 代碼，若字元串中有手動分頁符 {nextpage} 則優先按手動分頁符進行分頁

$content = file_get_contents('text.txt');

$ipage = $_GET["ipage"]? intval($_GET["ipage"]):1;

$CP = new cutpage();

$CP->pagestr = $content;

$CP->cut_str();

echo $CP->pagearr[$ipage-1]."<hr/>";

echo $CP->show_prv_next();