PHP QR code generation code

<?php
/*
二维码
*/
$urlToEncode="http://bbs.it-home.org";
generateQRfromGoogle($urlToEncode);
function generateQRfromGoogle($chl,$widhtHeight ='150',$EC_level='L',$margin='0')
 {
    $url = urlencode($url);
    echo '<img src="http://chart.apis.google.com/chart?chs='.$widhtHeight.'x'.$widhtHeight.'&cht=qr&chld='.$EC_level.'|'.$margin.
'&chl='.$chl.'" alt="QR code" widhtHeight="'.$size.'" widhtHeight="'.$size.'"/>';
 }
?>

<?php
/*
生成二维码
*/
 include('./phpqrcode.php');
   // 二维码数据
   $data = 'http://bbs.it-home.org.com';
   // 纠错级别：L、M、Q、H
   $errorCorrectionLevel = 'L';
    // 点的大小：1到10
   $matrixPointSize = 4;
   // 生成的文件名
   $path = "erwei/";
   if (!file_exists($path)){
        mkdir($path);
   }
   $filename = $path.$errorCorrectionLevel.'.'.$matrixPointSize.'.png';
   QRcode::png($data, $filename, $errorCorrectionLevel, $matrixPointSize, 2);
   echo "<img  src='$filename' / alt="PHP QR code generation code" >";
?>