php获取当前url然后生成二维码显示

<?php
function curPageURL()
{
    $pageURL = 'http';
    if ($_SERVER["HTTPS"] == "on")
    {
        $pageURL .= "s";
    }
    $pageURL .= "://";

    if ($_SERVER["SERVER_PORT"] != "80")
    {
        $pageURL .= $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . $_SERVER["REQUEST_URI"];
    }
    else
    {
        $pageURL .= $_SERVER["SERVER_NAME"] . $_SERVER["REQUEST_URI"];
    }
    return $pageURL;
}

$urlToEncode=curPageURL(); 

generateQRfromGoogle($urlToEncode);
function generateQRfromGoogle($chl,$widhtHeight ='100',$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.'"/>';
}
?>

二维码widhtHeight的最佳高度本人测试后，56像素为最佳