PHP示例代码：实现微信关注公众号扫码登录功能
```php <?php // 获取微信关注公众号二维码图片的URL function getQRCodeUrl($appid, $secret) { $url = "https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token="; $access_token = getAccessToken($appid, $secret); $url .= urlencode($access_token); $data = array( 'action_name' => 'QR_SCENE', 'expire_seconds' => 604800, 'action_info' => array( 'scene' => array( 'scene_id' => time() ) ) ); $json = json_encode($data); $result = http_post($url, $json); $
PHP判断是否首次关注公众号，扫码关注公众号获取微信用户头像、openid和省市等信息源码。
第一步：获取关注二维码ticket,并且传参二维码qrcode表主键id
$sql="INSERTINTO`qrcode`(`addtime`)VALUES('".time()."')";mysql_query($sql);$scene_id=mysql_insert_id();$url='https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid='.$appid.'&secret='.$appsecret;$access_token_array=json_decode(curlGet($url),true);$access_token=$access_token_array['access_token'];//echo$access_token;exit;$qrcode_url='https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token='.$access_token;$post_data=array();$post_data['expire_seconds']=3600*24;//有效时间$post_data['action_name']='QR_SCENE';$post_data['action_info']['scene']['scene_id']=$scene_id;//传参用户uid，微信端可获取$json=curlPost($qrcode_url,json_encode($post_data));if(!$json['errcode']){$ticket=$json['ticket'];$ticket_img='https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket='.urlencode($ticket);}else{echo'发生错误：错误代码'.$json['errcode'].'，微信返回错误信息：'.$json['errmsg'];exit;}第二步：微信服务端接受数据，并且用户登录信息
$postObj=simplexml_load_string($postStr,'SimpleXMLElement',LIBXML_NOCDATA);$scene_id=str_replace("qrscene_","",$postObj->EventKey);$openid=$postObj->FromUserName;//openid$ToUserName=$postObj->ToUserName;//转换角色$Event=strtolower($postObj->Event);if($Event=='subscribe'){//首次关注$is_first=0;}elseif($Event=='scan'){//已关注$is_first=1;}$access_token=$this->getAccessToken();$userinfo=$this->getUserinfo($openid,$access_token);$sql="UPDATE`qrcode`SET`openid`='".$openid."',logintime='".time()."',is_first=".$is_first.",nickname='".$userinfo['nickname']."'".",avatar='".$userinfo['avatar']."',sex='".$userinfo['sex']."',province='".$userinfo['province']."',city='".$userinfo['city']."',country='".$userinfo['country']."'WHERE`id`=".$scene_id."";mysql_query($sql);第三步：每隔2秒检测是否关注微信公众号
<script>check_login();functioncheck_login(){$.post("check_login.php",{scene_id:<?phpecho$scene_id;?>},function(data){varattention='首次关注';if(data.is_first==1){attention='已关注过';}if(data.openid!=null){alert("扫码成功，openid为"+data.openid+"nickname:"+data.nickname);location.reload();}else{setTimeout("check_login()",2000);}},"json");}</script>通过微信openid和access_token获取微信用户信息，并存入表当中的信息如下：
<tr><th>openid</th><th>昵称</th><th>性别</th><th>国家</th><th>省份</th><th>城市</th><th>头像</th><th>是否关注过</th><th>登录时间</th></tr>
