ดึงข้อมูล session โดยใช้ Curl แต่ข้อมูลไม่แสดงผลครับ

			  if($_SESSION['user_no'] == "")
			  {
              	echo '<form id="login" name="login" method="post" action="">
                <table width="100%">
                  <tr>
                    <td width="32%" align="right">Account :</td>
                    <td width="68%"><label for="username"></label>
                      <input name="username" type="text" class="textbox_01" maxlength="32" id="username" /></td>
                  </tr>
                  <tr>
                    <td align="right">Password :</td>
                    <td><label for="password"></label>
                      <input name="password" type="password" maxlength="32" class="textbox_01" id="password" /></td>
                  </tr>
                  <tr>
                    <td align="right"></td>
                    <td><input type="submit" name="submit" id="submit" value="LOGIN" /></td>
                  </tr>
                </table>
              	</form>';
				if($_POST['submit'])
				{
					$api->login($_POST['username'],$_POST['password']);
				}
			  }
              else
			  {
				  include_once("include/menu_member.php");
			  }

	public function login($username,$password)
	{
		$curl = curl_init('http://'.SERVER_IP.':'.SERVER_PORT.'/'.SYSTEM_DIR.'system.php?id=1');
		curl_setopt($curl, CURLOPT_POST, 1);
		curl_setopt($curl, CURLOPT_POSTFIELDS,"username=".$username."&password=".$password."");
		$curl_content = curl_exec($curl);
		curl_close($curl);
	}

	public function login($username,$password)
	{
		global $sql;
		$login_sql = $sql->prepare("SELECT * FROM C9Unity.Auth.TblAccount WHERE cAccId = :acc AND cPassword = :pass");
		$login_sql->BindParam(":acc",$username);
		$login_sql->BindParam(":pass",$password);
		$login_sql->execute();
		$login = $login_sql->fetch(PDO::FETCH_ASSOC);
		if(!$login)
		{
			$this->popup("ชื่อบัญชีหรือรหัสผ่านไม่ถูกต้อง");
		}
		else
		{
			$_SESSION['user_no'] = $login['cAccNo'];
			$_SESSION['account'] = $login['cAccId'];
			session_write_close();
			$this->go(WEBSITE);
		}
	}

if($a == 1)
{
	$api->login($_POST['username'],$_POST['password']);
}