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<?php
/*
 * 文章內容分頁類
*/
header("Content-type: text/html; charset=utf-8");
class cutpage {
    private $pagestr; //被切分的內容
    private $pagearr; //被切分文字的數組格式
    private $sum_word; //總字數(UTF-8格式的中文字符也包括)
    private $sum_page; //總頁數
    private $page_word; //一頁多少字
    private $cut_tag; //自動分頁符
    private $cut_custom; //手動分頁符
    private $page; //當前切分的頁數，第幾頁
    private $url;
    function __construct($pagestr, $page_word = 6500) {
        $this->page_word = $page_word;
        $this->cut_tag = array("</table>", "</div>", "</p>", "<br/>", "”。", "。", ".", "！", "……", "？", ",");
        $this->cut_custom = "{nextpage}";
        if (intval(trim($_GET['page']))) {
            $tmp_page = intval(trim($_GET['page']));
        } else {
            $tmp_page = 0;
        }
        $this->page = $tmp_page > 1 ? $tmp_page : 1;
        $this->pagestr = $pagestr;
    }
    function cut_str() {
        $str_len_word = strlen($this->pagestr);
        //獲取使用strlen得到的字符總數
        $i = 0;
        if ($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個字后的page_word個字符
                            $cut_tmp = strrpos($str_tmp, $v); //找出從第cut_start個字之后，page_word個字之間，逆向查找第一個分頁符的位置
                            if ($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;
        return $page_arr;
    }
    // //顯示上一條，下一條
    // function pagenav() {
    //     $this->set_url();
    //     $str = '';
    //     for ($i = 1;$i <= $this->sum_page;$i++) {
    //         if ($i == $this->page) {
    //             $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["page"]);
    //     if (empty($arr_url)) {
    //         $str = "page=";
    //     } else {
    //         $str = http_build_query($arr_url) . "&page=";
    //     }
    //     $this->url = "http://" . $_SERVER["HTTP_HOST"] . $_SERVER["PHP_SELF"] . "?" . $str;
    // }
}
?>