$path = ROOT_PATH; //tp项目根路径  

      require_once  $path.'vendor/phpqrcode/phpqrcode.php'; //加载phpqrcode库

        $url = 'http://'.$_SERVER['HTTP_HOST'].'/home/index/detail?id='.$param['id'];

        $value = $url;             //二维码内容

        $errorCorrectionLevel = 'L';   //容错级别

        $matrixPointSize = 26;        //生成图片大小

        $filename = 'qrcode/'.microtime().'.png';

        QRcode::png($value,$filename , $errorCorrectionLevel, $matrixPointSize, 2);

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PHP QR Code - QR code generator, an LGPL PHP library