> I have a object "db_config.php"

> class DbConfig{
>          private $db_url = 'localhost:3333';
>          private $db_user = 'root';
>          private $db_pwd = 'root';
>          private $db_name = 'xinxiwang';
>          function __get($property_name){
>                  return $this->$property_name;
>                  }

>          public function getConn(){
>                  $link = mysql_connect($this->db_url,$this->db_user,$this->db_pwd)
>          or die("can not connect to Mysql server");
>                  mysql_select_db($this->db_name,$link)
>          or die("can not found database " . $this->db_name );
>                  return $link;
>                  }
> }

> I will in a other php file include it "test.php"

> require (db_config.php);

> function fri_select($db,$pagenum,$counts){
>          $sql = "call friendlink_select($pagenum,$counts)";
>          $result = mysql_query($sql,$db);
>          mysql_close($db);
>          if($db){
>                  echo "in function, con is alive;<br>";
>                  }else{
>                  echo "in function , con is dead";
>                          }
>          if(isset($db)){
>                  echo "in function,con is alive;<br>";
>                  }else{
>                  echo "in function , con is dead";
>                          }
>          if(!empty($db)){
>                  echo "in function,con is alive;<br>";
>                  }else{
>                  echo "in function , con is dead";
>                          }
>          return $result;
> }

> $db = new DbConfig();
> $dbs = $db->getConn();

> $result = fri_select($dbs,1,6);
> if($dbs){
>          echo "out function, con is alive;<br>";
>          }else{
>          echo "out function , con is dead";
>                  }
> if(isset($dbs)){
>          echo "out function,con is alive;<br>";
>          }else{
>          echo "out function , con is dead";
>                  }
> if(!empty($dbs)){
>          echo "out function,con is alive;<br>";
>          }else{
>          echo "out function , con is dead";
>                  }

> it will out put

> in function,con is alive;
> in function,con is alive;
> in function,con is alive;
> out function, con is alive;
> out function,con is alive;
> out function,con is alive;

> why???I had close it in function!!!who can tell me??
> thanks very much!!!