php判断用户是否关注微信公众号
第一想法是，通过获取公众号的关注列表，然后搜索列表中是否有参与者的openid。
<?php
$access_token = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=XXXXXXXXXXXXXXXXXX&secret=XXXXXXXXXXXXXXXXXXXXXXXXXX";
$access_msg = json_decode(file_get_contents($access_token));
$token = $access_msg->access_token;
$subscribe_msg = "https://api.weixin.qq.com/cgi-bin/user/info?access_token=$token&openid=$_GET";
$subscribe = json_decode(file_get_contents($subscribe_msg));
$gzxx = $subscribe->subscribe;
//
if($gzxx === 1){
echo "已关注";
}else{
echo "未关注";
}
就是这种方法需要每次都要获取一下关注列表，而且，当公众号的粉丝比较多时，这种方法就比较吃力了。
第二个代码案例
<?php
$access_token = $this - > _getAccessToken();
$subscribe_msg = 'https://api.weixin.qq.com/cgi-bin/user/info?access_token='.$access_token.'&openid='.$_SESSION['wecha_id'];
$subscribe = json_decode($this - > curlGet($subscribe_msg));
$zyxx = $subscribe - > subscribe;
if ($zyxx !== 1) {
echo'未关注！';
}
private function _getAccessToken() {
$where = array('token' = > $this - > token);
$this - > thisWxUser = M('Wxuser') - > where($where) - > find();
$url_get = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid='.$this - > thisWxUser['appid'].'&secret='.$this - > thisWxUser['appsecret'];
$json = json_decode($this - > curlGet($url_get));
if (!$json - > errmsg) {
} else {
$this - > error('获取access_token发生错误：错误代码'.$json - > errcode.',微信返回错误信息：'.$json - > errmsg);
}
return $json - > access_token;
}
?>
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