How to implement phpqrcode to generate QR code with logo in Thinkphp3.2.3

public function qrcode($url="www.baidu.com",$level=3,$size=4)

  {

       Vendor('phpqrcode.phpqrcode');

       $errorCorrectionLevel =intval($level) ;//容错级别

       $matrixPointSize = intval($size);//生成图片大小

       //生成二维码图片

       $object = new \QRcode();

       $object->png($url, false, $errorCorrectionLevel, $matrixPointSize, 2); 

  }

include 'phpqrcode.php'; 

$value = 'http://www.cnblogs.com/txw1958/'; //二维码内容 

$errorCorrectionLevel = 'L';//容错级别 

$matrixPointSize = 6;//生成图片大小 

//生成二维码图片 

QRcode::png($value, 'qrcode.png', $errorCorrectionLevel, $matrixPointSize, 2); 

$logo = 'logo.png';//准备好的logo图片 

$QR = 'qrcode.png';//已经生成的原始二维码图 

if ($logo !== FALSE) { 

  $QR = imagecreatefromstring(file_get_contents($QR)); 

  $logo = imagecreatefromstring(file_get_contents($logo)); 

  $QR_width = imagesx($QR);//二维码图片宽度 

  $QR_height = imagesy($QR);//二维码图片高度 

  $logo_width = imagesx($logo);//logo图片宽度 

  $logo_height = imagesy($logo);//logo图片高度 

  $logo_qr_width = $QR_width / 5; 

  $scale = $logo_width/$logo_qr_width; 

  $logo_qr_height = $logo_height/$scale; 

  $from_width = ($QR_width - $logo_qr_width) / 2; 

  //重新组合图片并调整大小 

  imagecopyresampled($QR, $logo, $from_width, $from_width, 0, 0, $logo_qr_width, 

  $logo_qr_height, $logo_width, $logo_height); 

} 

//输出图片 

imagepng($QR, 'helloweixin.png'); 

echo '<img src="helloweixin.png">';