PHP静默方式获取微信用户openid，单文件完成微信支付
2019-10-23 admin php 1629
通过跳转获取用户的openid，跳转流程如下：
1. 设置自己需要调回的url及其其他参数，跳转到微信服务器
https://open.weixin.qq.com/connect/oauth2/authorize
拼接成这样能获得code:
https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect
2. 微信服务处理完成之后会跳转回用户redirect_uri地址，此时会带上一些参数，如：code
3. 通过code调用微信链接获取access_token，再从工作平台获取openid;
静默方式获取时，需要把微信参数中scope的值变成snsapi_base ！但是应用授权作用域，snsapi_base （只能获取用户openid）！
代码如下：
//获取用户微信openid
public function GetOpenid(){
$appid = env('WEIXIN_KEY');
$appKey = env('WEIXIN_SECRET');
//通过code获得openid
if (!isset($_GET['code'])){
//触发微信返回code码
$scheme = $_SERVER['HTTPS']=='on' ? 'https://' : 'http://';
$uri = $_SERVER['PHP_SELF'].$_SERVER['QUERY_STRING'];
if($_SERVER['REQUEST_URI']) $uri = $_SERVER['REQUEST_URI'];
$baseUrl = urlencode($scheme.$_SERVER['HTTP_HOST'].$uri);
$urlObj["appid"] = $appid;
$urlObj["redirect_uri"] = "$baseUrl";
$urlObj["response_type"] = "code";
$urlObj["scope"] = "snsapi_base";
$urlObj["state"] = "STATE"."#wechat_redirect";
$buff = "";
foreach ($urlObj as $k => $v){
if($k != "sign") $buff .= $k . "=" . $v . "&";
}
$bizString = trim($buff, "&");
$url = "https://open.weixin.qq.com/connect/oauth2/authorize?".$bizString;
Header("Location: $url");
exit();
} else {
//获取code码，以获取openid
$code = $_GET['code'];
$urlObj["appid"] = $appid;
$urlObj["secret"] = $appKey;
$urlObj["code"] = $code;
$urlObj["grant_type"] = "authorization_code";
$buff = "";
foreach ($urlObj as $k => $v){
if($k != "sign")
$buff .= $k . "=" . $v . "&";
}
$bizString = trim($buff, "&");
$url = "https://api.weixin.qq.com/sns/oauth2/access_token?".$bizString;
$options = array();
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
if (!empty($options)) {
curl_setopt_array($ch, $options);
}
//https请求 不验证证书和host
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
$res = curl_exec($ch);
curl_close($ch);
//取出openid
$data = json_decode($res,true);
$openid = $data['openid'];
//dd($openid);
return $openid;
}
}其中，appid和appKey需要填写，在公众号后台获取。
单元文件完成微信支付：
