微信开放平台提供了网站扫码登录的接口，用于获取用户基本信息（头像，昵称）方便网站快速接入微信登录，快捷登录。需要使用登录接口，需要成为微信开放平台认证开发者（300元）才可以获得这个接口权限。
准备工作：
1、准备APPID、APPSECRET
2、准备接口地址
3、准备REDIRECT_URI
获取code接口
https://open./connect/qrconnect?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect
获取acess_token、openid接口
https://api./sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code
获取用户信息接口：
https://api./sns/userinfo?access_token=access_token&openid=openid
流程：
1、获取CODE
2、获取access_token、openid
3、获取用户信息
操作：
1、请求CODE
参数说明
通过接口地址，拼接以上参数进行访问即可
https://open./connect/qrconnect?appid=APPID&redirect_uri=这里填写redirect_uri&response_type=code&scope=SCOPE&state=STATE#wechat_redirect
redirect_uri说明
这是点击上面地址扫码后跳转的地址，跳转的地址回给你带上两个参数，code和state参数。
state说明
用于保持请求和回调的状态，授权请求后原样带回给第三方。该参数可用于防止csrf攻击（跨站请求伪造攻击），建议第三方带上该参数，可设置为简单的随机数加session进行校验。
可以自己生成随机字符串，为了简单学习，我这里用时间戳进行MD5加密简单生成
<?php$data = time();$state = MD5($data);?>
例如你的redirect_uri是/login.php，那么扫码后，跳转的地址会是这样的。
/login.php?code=生成的code&state=生成的state
当然redirect_uri需要进行urlEncode编码。
<?php$redirect_uri = urlEncode("/login.php");?>
最终获取CODE的访问链接就是这样的：
<?php$appid = "填写你的APPID";$redirect_uri = UrlEncode("/login.php");$data = time();$state = MD5($data);//跳转页面echo "<script>location.href=\"https://open./connect/qrconnect?appid=$appid&redirect_uri=$redirect_uri&response_type=code&scope=snsapi_login&state=$state#wechat_redirect\";</script>";?>
然后就跳转到了一个扫码的页面了：
2、获取access_token和openid
通过curl向接口发起请求即可
<?php//从redirect_uri得到code$code = $_GET["code"];$appid = "填写你的";$secret = "填写你的";//获取access_token和openid$url = "https://api./sns/oauth2/access_token?appid=$appid&secret=$secret&code=$code&grant_type=authorization_code";function post($url) {$ch = curl_init();curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);curl_setopt($ch, CURLOPT_POST, 1);curl_setopt($ch, CURLOPT_POSTFIELDS, $data);curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);$rst = curl_exec($ch);curl_close($ch);return $rst;}//发送请求$result = post($url);//返回接口的数据$arr = json_decode($result,true);//解析json，单独把openid和access_token取出来待会用$openid = $arr['openid'];$token = $arr['access_token'];?>
3、获取用户信息
<?php//这里是接着上面的代码的//获取用户信息需要openid 和 access_token//获取用户信息$getinfourl = "https://api./sns/userinfo?access_token=$token&openid=$openid";function getinfo($getinfourl) {$ch = curl_init();curl_setopt($ch, CURLOPT_URL, $getinfourl);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);curl_setopt($ch, CURLOPT_POST, 1);curl_setopt($ch, CURLOPT_POSTFIELDS, $data);curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);$rst = curl_exec($ch);curl_close($ch);return $rst;}//发送请求获取用户信息$info_result = getinfo($getinfourl);//返回接口的数据// echo $info_result;$info_arr = json_decode($info_result,true);$nickname = $info_arr['nickname'];$headimgurl = $info_arr['headimgurl'];//显示头像和昵称echo "<img src=\"$headimgurl\"/>";echo "<h2>$nickname<h2>";?>
完整代码
code.php
<?php$appid = "填写你的";$redirect_uri = UrlEncode("/login.php");$data = time();$state = MD5($data);echo "<script>location.href=\"https://open./connect/qrconnect?appid=$appid&redirect_uri=$redirect_uri&response_type=code&scope=snsapi_login&state=$state#wechat_redirect\";</script>";?>
login.php
<!DOCTYPE html><html><head><title>登录成功！</title><style type="text/css">*{margin:0px;padding: 0px;}#headimg{width: 180px;height: 180px;margin:100px auto 10px;border-radius: 100%;}#headimg img{width: 180px;height: 180px;border-radius: 100%;}h2{text-align: center;}p{text-align: center;font-size: 38px;font-weight: bold;margin-top: 20px;}</style></head><body></body></html><?php$code = $_GET["code"];$appid = "填写你的";$secret = "填写你的";//获取access_token和openid$url = "https://api./sns/oauth2/access_token?appid=$appid&secret=$secret&code=$code&grant_type=authorization_code";function post($url) {$ch = curl_init();curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);curl_setopt($ch, CURLOPT_POST, 1);curl_setopt($ch, CURLOPT_POSTFIELDS, $data);curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);$rst = curl_exec($ch);curl_close($ch);return $rst;}//发送请求$result = post($url);//返回接口的数据$arr = json_decode($result,true);$openid = $arr['openid'];$token = $arr['access_token'];//获取用户信息$getinfourl = "https://api./sns/userinfo?access_token=$token&openid=$openid";function getinfo($getinfourl) {$ch = curl_init();curl_setopt($ch, CURLOPT_URL, $getinfourl);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);curl_setopt($ch, CURLOPT_POST, 1);curl_setopt($ch, CURLOPT_POSTFIELDS, $data);curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);$rst = curl_exec($ch);curl_close($ch);return $rst;}//发送请求获取用户信息$info_result = getinfo($getinfourl);//返回接口的数据// echo $info_result;$info_arr = json_decode($info_result,true);$nickname = $info_arr['nickname'];$headimgurl = $info_arr['headimgurl'];$errcode = $info_arr['errcode'];if ($errcode == "41001") {echo "<p>登录失效，请重新扫码登录<p>";echo "<p><a href=\"code.php\">登录</a><p>";}else{echo "<div id=\"headimg\"><img src=\"$headimgurl\"/></div>";echo "<h2>$nickname<h2>";echo "<p>登录成功<p>";}?>
DEMO:/WX-OPEN-LOGIN/code.php
时间：-1-26
作者：TANKING
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学习交流微信：face6009
