PHP Mysql echoing data in one column from multiple rows -

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my mysql table looks this:

mysql table

and want retrieve data column 'host' uid equal twenty.

i have code connect database , return row when uid equal twenty

db.php:

public function query($sql, $params = array()){     $this->_error = false;     if($this->_query = $this->_pdo->prepare($sql)){         $x = 1;         if(count($params)){             foreach($params $param){                 $this->_query->bindvalue($x, $param);                 $x++;             }         }          if($this->_query->execute()){             $this->_results = $this->_query->fetchall(pdo::fetch_obj);             $this->_count = $this->_query->rowcount();         } else {             $this->_error = true;         }     }      return $this; }  public function results(){     return $this->_results; }

server.php:

public static function get($uid){     $_db = db::getinstance();     $data = $_db->get('servers', array('uid', '=', $uid));      return $data->results(); }

curl.php:

$a = server::get('20'); var_dump($a);

the var_dump on return gives following: php var_dump return

array(2) { [0]=> object(stdclass)#5 (4) { ["sid"]=> string(2) "13" ["host"]=> string(12) "example.home" ["port"]=> string(4) "8081" ["uid"]=> string(2) "20" } [1]=> object(stdclass)#6 (4) { ["sid"]=> string(3) "153" ["host"]=> string(15) "stream.as.ag.ca" ["port"]=> string(5) "23434" ["uid"]=> string(2) "20" } }

note: if question has been answered somewhere else, link provided couldn't find answer.

i think should able pull each host this. 

foreach($a $row) {     echo $row->host; }

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