PHP -- 二维码生成

//使用ThinkPhp 框架导入 qrcode 文件

function qrcode($uid) {

        $value = 'http://h5.bilancaijing.com?trid=' . $uid; //二维码内容   
        //判断用户是否已经生成二维码
        if (!file_exists('Public/images/qrcode' . $uid . '.png')) {
            vendor('phpqrcode.phpqrcode');
            $errorCorrectionLevel = 'L'; //容错级别   
            $matrixPointSize = 6; //生成图片大小   
            $obj = new \QRcode();
//生成二维码图片   
            $obj->png($value, 'qrcode.png', $errorCorrectionLevel, $matrixPointSize, 2);
            $logo = 'logo1992.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);
            }
            $files = date("Ymd");
            $fileurl = "/Public/images/{$files}";
            if (!file_exists("." . $fileurl)) {
                $this->create_folders("." . $fileurl);
            }
            $fileurl.="/qrcode{$uid}.png";

//输出图片   
            imagepng($QR, ltrim($fileurl,"/"));
            return $fileurl;
        }
    }

    public function create_folders($dir) {
        return is_dir($dir) or ( $this->create_folders(dirname($dir)) and mkdir(iconv("UTF-8", "GBK", $dir), 0777, true));
    }