/**
* @param $url 二维码链接
* @param $uid 用户id
* @return string 二维码路径
*/
public function getQRcode($url='http://xxxx.com/api/user/invite/uid/85',$uid='85'){
import('phpqrcode',EXTEND_PATH.'phpqrcode');
$sharelink = $url;
$shareimg = mt_rand(). $uid . '.png';
$shareimg = 'static/images/share/'. $shareimg;
\QRcode::png($sharelink, $shareimg, QR_ECLEVEL_M, 8,4);
//追加文字
$image = imagecreatefrompng($shareimg);
$font = ROOT_PATH.'public/static/font/msyh.ttf'; // 字体文件
$color = imagecolorallocate($image,0,0,0); // 文字颜色
imagettftext($image, 15, 0, 80, 288, $color, $font, '123456'); // 创建文字
$imgurl = 'static/images/share/share_'. mt_rand(). $uid . '.png';
imagepng($image, $imgurl);//保存新生成的
imagedestroy($image);//删除原来的图片
return $imgurl;
}