<"http";
 
 
  /**
  * @name 构造函数
  * @param $flag 是否沙箱环境
  */
  public function __construct($redirect_uri, $client_id,$client_secret,$scope,$state,$flag = true)
  {
    $this->_sanbox_flag = $flag;
    $this->_redirect_uri = $redirect_uri;
    $this->_client_id = $client_id;
    $this->_client_secret = $client_secret;
    $this->_scope = $scope;
    $this->_state = $state;
  }
 
  /**
   * 创建paypal request url
   * @return string
   */
  public function create_request_url()
  {
    $oauth2_auth_uri = $this->_sanbox_flag "client_id=%s&client_secret=%s&grant_type=authorization_code&code=%s",$this->_client_id,$this->_client_secret,$code);
      if($this->_sanbox_flag)
        $ch = curl_init($this->_token_service_sandbox_url);
      else
        $ch = curl_init($this->_token_service_live_url); 
 
      $options = array(
        CURLOPT_POST      => 1,
        CURLOPT_VERBOSE    => 1,
        CURLOPT_POSTFIELDS   => $postvals,
        CURLOPT_RETURNTRANSFER => 1,
        CURLOPT_SSL_VERIFYPEER => FALSE,
        //CURLOPT_SSLVERSION => 2
      );
 
      curl_setopt_array($ch, $options);
      $response = curl_exec($ch);
      $error = curl_error($ch);
 
      curl_close( $ch );
 
      if (!$response ) {
        throw new Exception( "Error retrieving access token: " . curl_error($ch));
      }
      $jsonResponse = json_decode($response );
 
      if ( isset( $jsonResponse->access_token) ) {
        $accessToken = $jsonResponse->access_token;
      }
 
    } catch( Exception $e) {
      throw new Exception($e->getMessage(), 1);
    }
 
    return $accessToken;
  }
 
  /**
   * get the PayPal user profile, decoded
   * @param string $accessToken
   * @return object
   */
  public function acquire_paypal_user_profile($accessToken ) {
    try {
      if($this->_sanbox_flag)
        $url = $this->_acquire_user_profile_sandbox_url . $accessToken;
      else
        $url = $this->_acquire_user_profile_live_url . $accessToken;  
 
      $ch = curl_init( $url );
      $options = array(
        CURLOPT_RETURNTRANSFER => 1,
        CURLOPT_SSL_VERIFYPEER => FALSE,
        //CURLOPT_SSLVERSION => 2
      );
      curl_setopt_array($ch, $options);
 
      $response = curl_exec($ch);
      $error = curl_error( $ch);
      curl_close( $ch );
 
      if (!$response ) 
      {
        return false;
      }
      return json_decode($response);
    } catch( Exception $e ) {
      return false;
    }
  }
}
?>