class Wprint{   //收集打印代碼   private $data = array();   //處理打印代碼   private $handle;   public function __construct()  {    header("Content-type:text/html;charsetutf-8");    $this->link(); //鏈接數據庫    $this->collect($_POST["username"],$_POST["content"],$_POST["ip"]);    $this->handle();   }   //鏈接數據庫   private function link()   {    $link = mysql_connect('localhost', 'root', '123456');    mysql_select_db('shen', $link);    mysql_query('SET NAMES utf8');   }   //收集打印代碼   private function collect($username,$content,$ip)   {     $code["username"] = $username;     $code["content"] = $this->check($content);     $code["ip"] = $ip;     $code["state"] = 0;     $code["priority"] = 0;     array_push($this->data,$code);//數據節點入棧   }   //處理打印代碼入庫   private function handle()   {    foreach($this->data as $value)    {$sql = "insert into print(username,content,ip,state,priority)values('{$value["username"]}','{$value["content"]}','{$value["ip"]}','{$value["state"]}','{$value["priority"]}')";     $query = mysql_query($sql);     if($query)     {      $id = mysql_insert_id(); //獲取最近insert操作得到的ID      echo "數據收集成功,正在排隊打印,排隊ID為".$id;      $this->num($id);     }     else     {      echo "數據收集失敗,請3秒后再一次提交";     }    }   }    //檢查傳人數據是否為空   private function check($string)   {    if(strlen($string) == 0 || $string == " ")    {     echo "數據收集失敗,打印內容為空";     exit;    }else    {     return $string;    }   }   //獲取打印排隊人數   private function num($id)   {    $sql = "select id from print where state=0 and id<".$id." order by id asc";    $query = mysql_query($sql);    $num = mysql_num_rows($query);    echo ",您前面還有".$num."個人在排隊";   }   //打印數據   public function Yprint()   {     $sql = "select id,content from print where state=0 order by id asc limit 1";     $query = mysql_query($sql);     $row = mysql_fetch_array($query);     if(!empty($row["content"]))     {      echo "<script tyle=/"text/javascript/">            window.print();        </script>";      $id = $row["id"];      $sql = "update print set state=1 where id=".$id;      mysql_query($sql);      echo "打印處理完成";     }else     {       echo $row["content"];     }   }}