<?php
    $urlToEncode="http://www.baidu.com";//要生成二维码的网址
    generateQRfromGoogle($urlToEncode);
    function generateQRfromGoogle($chl,$widhtHeight ='150',$EC_level='L',$margin='0'){
        $url = urlencode($chl);
	echo '<img src="http://chart.apis.google.com/chart?chs='.$widhtHeight.'x'.$widhtHeight.'&cht=qr&chld='.$EC_level.'|'.$margin.'&chl='.$url.'" alt="QR code" widhtHeight="'.$widhtHeight.'"/>';//Google API接口，若失效可到Google网址查询最新接口
}
?>

<?php
    include "phpqrcode.php";//引入PHP QR库文件
    $value="http://www.csdn.net";
    $errorCorrectionLevel = "L";
    $matrixPointSize = "4";
    QRcode::png($value, false, $errorCorrectionLevel, $matrixPointSize);
    exit;
?>