php生成二维码

php生成二维码的几种方式，用起来挺方便，实现的几种方法都经过测试通过
1.利用google开放接口
 get方法实现方式一：
 

$urlToEncode="163.com";  
generateQRfromGoogle($urlToEncode);  
function generateQRfromGoogle($chl,$widhtHeight ='150',$EC_level='L',$margin='0')  {  
     $url = urlencode($url);  
     return  '<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.'"/>';  
}  

post方法实现方式:
$width = 300;  
$height = 300;  
$string = "163.com";  
function qrcode($width,$height,$string)  
{  
    $post_data = array();  
    $post_data['cht'] = 'qr';  
    $post_data['chs'] = $width."x".$height;  
    $post_data['chl'] = $string;  
    $post_data['choe'] = "UTF-8";  
    $url = "http://chart.apis.google.com/chart";  
    $data_Array = array();  
    foreach($post_data as $key => $value)  
    {  
        $data_Array[] = $key.'='.$value;  
    }  
    $data = implode("&",$data_Array);  
    //echo $data;  
    $ch = curl_init();  
    curl_setopt($ch, CURLOPT_POST, 1);  
    curl_setopt($ch, CURLOPT_HEADER, 0);  
    curl_setopt($ch, CURLOPT_URL, $url);      
    curl_setopt($ch, CURLOPT_POSTFIELDS,$data);  
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  
    $result = curl_exec($ch);  
    
    //echo "<img src =\"data:image/png;base64,".base64_encode($result)."\" >"; 注意，不写header的写法  
  
     return $result;  
}  
  
header("Content-type:image/png");  
echo qrcode($width,$height,$string);  


2.利用php类库PHP QR Code来实现
首先下载类库包 
地址：http://phpqrcode.sourceforge.net/
下载：http://sourceforge.net/projects/phpqrcode/
 


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