H5微信网页授权接口开发 PHP

<?php $appId = 'xxx'; // 公众号AppId $appSecret = 'xxx'; // 公众号AppSecret $code = $_GET['code']; $state = $_GET['state']; $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=$appId&secret=$appSecret&code={$code}&grant_type=authorization_code"; $a = file_get_contents($url); switch($state){ case 'project1': preg_match_all("/\"openid\":\"(.*?)\"/", $a, $matches, PREG_SET_ORDER); $openid = $matches[0][1]; $json=(array)json_decode($a); if(!isset($json['errcode'])){ $openid = $json['openid']; $url ="https://api.weixin.qq.com/sns/userinfo?access_token=".$json['access_token']."&openid=".$json['openid']; $a = file_get_contents($url); $json = (array)json_decode($a); $nickname = $json['nickname']; $headimgurl = $json['headimgurl']; header("Location:http://xxx/index.html?openid=$openid&nickname=$nickname&headimgurl=$headimgurl"); }else{ } break; /* case 'project2': ... break; */ default: echo "ERROR"; } ?>