PHP 生成验证码

//加载 vendor目录的phpqrcode.类文件
$a = vendor("phpqrcode.qrlib");
// 创建目录
echo mkdir(__ROOT__.'/Uploads/qrcodes');

//生成文件名 

$filename = __ROOT__.'/Uploads/qrcodes/qrcode-'.md5(UID).'.png';

$errorCorrectionLevel = 'L';
$matrixPointSize = 4;

$url = 'http://163.com';

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

echo '<img src="'.$filename.'">';

----------------------------------------

百度app 

/*二维码 */
 public function qrcode(){
 $wx['share_url'] = $url = 'http://'.$_SERVER['HTTP_HOST'].__ROOT__.'/?r_uid='.UID;
 $wx['url'] = 'http://'.$_SERVER['HTTP_HOST'].__SELF__;
 $ch = curl_init();
 $url = 'http://apis.baidu.com/3023/qr/qrcode?qr='.$wx['share_url'];
 $header = array(
 'apikey:e7acb07121f84142a79795a37f8333b9', // apikey
 );
// // 添加apikey到header
 curl_setopt($ch, CURLOPT_HTTPHEADER , $header);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 // 执行HTTP请求
 curl_setopt($ch , CURLOPT_URL , $url);
 $res = curl_exec($ch); //发送请求
 $a = json_decode($res);
// var_dump($a);
 echo '<img src="'.$a->url.'">';
// // var_dump(json_decode($res));
// }