长文章分页显示类
<?php /** * 文章分页类 * * @author ymz lymz.86@gmail.com * @version 1.3 */ /* For example: $curPage = $_GET['page']; $totalPage = $curPage; $objArt = new article($article,40,14); $objArt->setWrapSign("<br/>"); $objArt->setMore('more','this is complete url address.'); $part = $objArt->getOnePage($curPage,$totalPage); echo $part; */ class article { var $string = ''; var $curPart = ''; var $allLine = 0; var $totalPage = null; var $curPage = 1; var $curLine = 1; var $onePageLine = 10; var $oneLineWord = 40; var $arrArticle = array(); var $wrapSign = "\n"; var $more = null; function article($str,$oneLineWord = 40,$onePageLine = 10) { $this->string = $str; $this->oneLineWord = $oneLineWord; $this->onePageLine = $onePageLine; } //设置换行符 function setWrapSign($str) { $this->wrapSign = $str; } //是否显示更多 function setMore($str,$link) { $this->more = array('word' => $str,'url' => $link); } //设置总页面、总行数,构造文章数组 function getAllPage($str='') { if ($str) $this->string = $str; $this->allLine = 0; $arrayStr = explode($this->wrapSign,$this->string); foreach ($arrayStr as $num => $part) { $length = $this->strlen($part); if ($length > $this->oneLineWord) { $tmp_line = ceil($length / $this->oneLineWord); } else { $tmp_line = 1; } $this->allLine += $tmp_line; $this->arrArticle[$num] = array( 'lines' => $tmp_line, 'string' => $part ); } $this->totalPage = ceil($this->allLine / $this->onePageLine); return $this->totalPage; } //获取某页数据 function getOnePage($page,&$totalPage) { if (is_null($this->totalPage)) $this->getAllPage(); $totalPage = $this->totalPage; !$page && $page = 1; $page > $totalPage && $page = $totalPage; $this->curPage = $page; $startLine = ($page - 1) * $this->onePageLine + 1; $endLine = $startLine + $this->onePageLine - 1; $tmp_line = 0; $tmp_str = ''; $key = count($this->arrArticle); foreach ($this->arrArticle as $k => $part) { $tmp_line += $part['lines']; if ($startLine > 1 && $tmp_line - $part['lines'] < $startLine && $tmp_line >= $startLine) { $tmp_str = ''; $startWord = ($startLine - ($tmp_line - $part['lines'] + 1)) * $this->oneLineWord; $startWord = $startWord < 0 ? 0 : $startWord; $needWord = $this->oneLineWord * $this->onePageLine; $part['string'] = $this->substr($part['string'],$startWord,$needWord); if ($tmp_line == $endLine) $this->_setLastLine($part['string']); } else if ($tmp_line == $startLine - 1) { $tmp_str = ''; continue; } else if ($tmp_line > $endLine) { $needWord = ($endLine - ($tmp_line - $part['lines'])) * $this->oneLineWord; $part['string'] = $this->substr($part['string'],0,$needWord); $this->_setLastLine($part['string']); } $tmp_str .= $part['string']; if ($tmp_line < $endLine && $k + 1 < $key) $tmp_str .= '<br/>'; else if ($tmp_line >= $endLine || $k + 1 == $key) { $this->_setLastLine($part['string']); break; } } $this->curPart = $tmp_str; if (!is_null($this->more)) $this->_setMore(); return $this->curPart; } //设置最后一行数据 function _setLastLine($str) { $this->getAllPage($str); $startWord = ($this->allLine - 1) * $this->oneLineWord; $this->lastLine = $this->substr($str,$startWord,$this->oneLineWord); } //获取最后一行数据 function getLastLine() { return $this->lastLine; } //对 more 进行设置 function _setMore() { $length = $this->strlen($this->lastLine); if ($length + 15 > $this->oneLineWord) { $length = $this->strlen($this->curPart); $this->curPart = $this->substr($this->curPart,0,$length - 9) . ' ... <a href="'.$this->more['url'].'">'.$this->more['word'].'</a>'; } else { $this->curPart .= ' ... <a href="'.$this->more['url'].'">'.$this->more['word'].'</a>'; } } //支持中文的字符串长度获取(每2个字符表示一个中文字符) function strlen($str) { $length = 0; for($i = 0,$len = strlen($str);$i < $len; ++ $i) { $w = substr($str,$i,1); if (ord($w) > 160) { $length += 2; $i += 2; } else $length ++; } return $length; } //截取字符串,长度不足则舍弃 function substr($str,$start,$len) { $string = ''; $length = strlen($str); $tmp_len = 0; $tmp_start = 0; for($i = 0;$i < $length; ++ $i) { if ($tmp_len >= $len) break; if ($i + 1 >= $start) {//die(','.$tmp_start); $w = substr($str,$tmp_start,1); if (ord($w) > 160) { if ($tmp_len + 2 <= $len) $string .= substr($str,$tmp_start,3); $i += 2; $tmp_len += 2; $tmp_start += 3; } else { $string .= substr($str,$tmp_start,1); ++ $tmp_start; ++ $tmp_len; } } else { $w = substr($str,$tmp_start,1); if (ord($w) > 160) { $i += 1; $tmp_start += 3; } else { ++ $tmp_start; } } } return $string; } } For example: $curPage = $_GET['page']; $totalPage = $curPage; $objArt = new article($article,40,14); $objArt->setWrapSign("<br/>"); $objArt->setMore('more','this is complete url address.'); $part = $objArt->getOnePage($curPage,$totalPage); echo $part;