class dividepage{//分頁類
private $total;//要顯示的總記錄數
private $url;//請求的url地址
private $displaypg;//每頁顯示的記錄數，預設為每頁顯示10條記錄
private $page;//當前頁碼
private $lastpg;//總頁數，即最後一頁的頁碼
private $prepg;//前一頁
private $nextpg;//後一頁
private $firstcount;//記錄條數開始的序號從0開始
private $startd;//記錄條數開始的記錄號.
private $stopd;//記錄條數結束的記錄號. //建構函式
public function __construct($url, $total, $displaypg){
$this->url = $url;//請求的url
$this->total = $total;//總記錄數
//if($displaypg == '')
$this->displaypg = $displaypg;//每頁顯示的記錄數
$this->initdividepage();//初始化分頁類
//echo ','.$this->displaypg;
} //初始化分頁類
private function initdividepage(){
//分析url
$parse_url = parse_url($this->url);//將url解釋為有固定索引值對的數組
$url_query = $parse_url['query'];//取出url中的查詢字串
if($url_query){//如果有查詢字串，則刪除查詢字串中當前頁的查詢欄位如：&page=$page或page=$page
ereg('(^|&)page=([0-9]*)', $url_query, $k);
$this->page = $k[2];//取得當前頁的值
$url_query = ereg_replace("(^|&)page=$this->page", '', $url_query);//刪除查詢字串中當前頁的查詢欄位如：&page=$page或page=$page
$this->url = str_replace($parse_url['query'], $url_query, $this->url);//保留其他的查詢字串，
$this->page = $this->page ? $this->page : 1;//w如果查詢字串中沒有當前頁的值就設當前頁為1
if($url_query){//如果有其他查詢字串，則以&page=$page形式添加翻頁查詢字串
$this->url .= '&page';
}else{//如果沒有其他查詢字串，則以page=$page形式添加翻頁查詢字串
$this->url .= 'page';
}
}else{//如果沒有查詢字串，則在url後添加?page=$page形式的翻頁查詢字串
$this->page = 1;
$this->url .= '?page';
}
$this->lastpg = ceil($this->total / $this->displaypg);//計算總頁數，即最後一頁的頁碼
$this->page = min($this->lastpg, $this->page);//如果當前頁大於總頁數，則當前頁為最後一頁的頁碼
$this->prepg = $this->page - 1;//上一頁為當前頁減一www.111cn.net
$this->nextpg = $this->page + 1;//(($this->page == $this->lastpg) ? $this->lastpg : ($this->page + 1));//下一頁為當前頁加一，如果當前頁為最後一頁，則下一頁為0
$this->firstcount = ($this->page - 1) * $this->displaypg;//計算當前頁，記錄條數開始的記錄號，從0開始.
$this->startd = $this->total ? ($this->firstcount + 1) : 0;//記錄開始號從1開始
$this->stopd = min($this->firstcount + $this->displaypg, $this->total);//記錄結束號
//echo $this->displaypg;
//echo $this->nextpg.'+=+='.$this->lastpg;
} public function getpageinfo(){//取得當前頁面的基本資料，如：顯示第 1-10 條記錄，共 23 條記錄。
return '<span class="pageinfostyle">顯示第<span class="numstyle">'.$this->startd.'-'.$this->stopd.'</span>條記錄，共<span class="numstyle">'.$this->total.'</span>條記錄。</span>';
} public function getcommonpagenav(){//取得通常的分頁導航，如：首頁 上一頁 下一頁 尾頁
$commonnav = '';
if($this->lastpg == 1){//如果只有一頁，則返回翻頁導航，退出，不顯示下一頁，上一頁等。。。
return $commonnav;
break;
}
$commonnav = '<a href="'.$this->url.'=1" class="compagestyle">首頁</a>';//設定首頁導航，page=1
if($this->prepg){
$commonnav .= '<a href="'.$this->url.'='.$this->prepg.'" class="compagestyle">上一頁</a>';
}else{
$commonnav .= '<a class="fcompagestyle">上一頁</a>';
}
if($this->nextpg <= $this->lastpg){
$commonnav .= '<a href="'.$this->url.'='.$this->nextpg.'" class="compagestyle">下一頁</a>';
}else{
$commonnav .= '<a class="fcompagestyle">下一頁</a>';
}
$commonnav .= '<a href="'.$this->url.'='.$this->lastpg.'" class="compagestyle">尾頁</a>';//顯示尾頁連結
return $commonnav;
} //取得跳轉分頁導航，如：第n頁
public function getjumppagenav(){
//<select name='topage' size='1' onchange='window.location="/test/page.php?page="+this.value'>
$jumpnav = '<span class="pageinfostyle">到第<select name="topage" size="1" class="topage" onchange='window.location="'.$this->url.'="+this.value'>'." ";
for($i = 1; $i <= $this->lastpg; $i++){
if($i == $this->page){//把當前頁的頁碼作為預設選項
$jumpnav .= '<option value="'.$i.'" selected>'.$i.'</option>'." ";
}else{
$jumpnav .= '<option value="'.$i.'">'.$i.'</option>'." ";
}
}
$jumpnav .= '</select>頁，共<span class="numstyle">'.$this->lastpg.'</span>頁</span>';
return $jumpnav;
} //取得所有的分頁導航
public function getallpagenav(){
$temp = $this->getpageinfo().$this->getcommonpagenav().$this->getjumppagenav();
return $temp;
} //取得當前頁需顯示的記錄，在資料庫教程中的限定範圍，如0-9
public function getlimitstr(){
//echo $this->page;
//echo $this->firstcount;
//echo $this->dispalypg;
$temp = $this->firstcount.','.$this->displaypg;
//echo $temp;
return $temp;
} } |
