第一步：
登录到蚂蚁金服开放平台 https://open.alipay.com/platform/home.htm，前提是有商户号。创建应用之后，然后到开发者中心开通对应功能。如图:
第二步：
到应用信息里面填写应用网关与授权回调地址。应用网关填写域名即可，如：www.baidu.com；授权回调地址则需要具体到页面或者方法，如：www.baidu.com/aliLogin.php。
第三步：
填写接口加签方式。去官方下载签名生成器，然后生成一对秘钥（应用公钥和应用私钥），设置好应用公钥之后，能拿到对应的支付宝公钥。（重点是 应用私钥和支付宝公钥）
第四步：
数据表的设计。可以新建数据表存储支付宝返回数据，也可以在用户表里面新加字段存储。我的实现方法是后者，如图：
下面代码可以看到支付宝返回数据存入对应字段
第五步：
下载sdk，地址 https://doc.open.alipay.com/docs/doc.htm?spm=a219a.7629140.0.0.iw1InW&treeId=193&articleId=103419&docType=1 。根据以上步骤拿到的appid，应用私钥（RSA_PRIVATE_KEY）和支付宝公钥（ALIPAY_RSA_PBULIC_KEY），开始调用支付宝接口获取数据。上代码：
1 /** 2 ?????* 支付宝授权登录 3 ?????*/ 4 ????public function aliLogin(){ 5 ????????//获取配置文件的ali参数 6 ????????$ali_config = C("ALI_CONFIG"); 7 ?8 ????????//应用的APPID 9 ????????$app_id = "2017061407485473";10 ????????//【成功授权】后的回调地址11 ????????$my_url = "http://".$_SERVER[‘HTTP_HOST‘]."/Home/User/aliLogin";12 13 ????????//Step1：获取auth_code14 ????????$auth_code = $_REQUEST["auth_code"];//存放auth_code15 ????????if(empty($auth_code)){16 ????????????//state参数用于防止CSRF攻击，成功授权后回调时会原样带回17 ????????????$_SESSION[‘alipay_state‘] = md5(uniqid(rand(), TRUE));18 ????????????//拼接请求授权的URL19 ????????????$url = "https://openauth.alipay.com/oauth2/publicAppAuthorize.htm?app_id=".$app_id."&scope=auth_user&redirect_uri=".$my_url."&state="20 ????????????????. $_SESSION[‘alipay_state‘];21 22 ????????????echo("<script> top.location.href=‘" . $url . "‘</script>");23 ????????}24 ????????//Step2: 使用auth_code换取apauth_token25 ????????if($_REQUEST[‘state‘] == $_SESSION[‘alipay_state‘] || 1)26 ????????{27 ????????????vendor("Alipay.AopClient"); //引入sdk28 ????????????$aop = new \AopClient();29 ????????????$aop->gatewayUrl ?????????? = "https://openapi.alipay.com/gateway.do";30 ????????????$aop->appId ???????????????? = $app_id;31 ????????????$aop->rsaPrivateKey ??????????= $ali_config[‘RSA_PRIVATE_KEY‘]; //应用私钥32 ????????????$aop->alipayrsaPublicKey ??= $ali_config[‘ALIPAY_RSA_PBULIC_KEY‘]; //支付宝公钥33 ????????????$aop->apiVersion ??????????? = ‘1.0‘;34 ????????????$aop->signType ????????????? = ‘RSA2‘;35 ????????????$aop->postCharset ????????????= ‘utf-8‘;36 ????????????$aop->format ??????????????? ??= ‘json‘;37 38 ????????????//根据返回的auth_code换取access_token39 ????????????vendor("Alipay.AlipaySystemOauthTokenRequest"); //调用sdk里面的AlipaySystemOauthTokenRequest类40 ????????????$request = new \AlipaySystemOauthTokenRequest();41 ????????????$request->setGrantType("authorization_code");42 ????????????$request->setCode($auth_code);43 ????????????$result = $aop->execute($request);44 ????????????$access_token = $result->alipay_system_oauth_token_response->access_token;45 46 ????????//Step3: 用access_token获取用户信息47 ????????????vendor("Alipay.AlipayUserInfoShareRequest"); //调用sdk里面的AlipayUserInfoShareRequest类48 ????????????$request = new \AlipayUserInfoShareRequest();49 ????????????$result = $aop->execute ( $request, $access_token);50 ????????????$responseNode = str_replace(".", "_", $request->getApiMethodName()) . "_response";51 ????????????$resultCode = $result->$responseNode->code;52 ????????????if(!empty($resultCode)&&$resultCode == 10000){53 ????????????????$user_data = $result->$responseNode;54 ????????????????$m = M("Member");55 ????????????????$data = array();56 ????????????????$data[‘sex‘] ?????????????= $user_data->gender==‘m‘?1:2;57 ????????????????$data[‘province‘] ?????= $user_data->province;58 ????????????????$data[‘city‘] ????????????= $user_data->city;59 ????????????????$data[‘person_name‘] ??= $user_data->nick_name;60 ????????????????$data[‘ali_openid‘] ???= $user_data->user_id;61 ????????????????$data[‘ali_name‘] ?????= $user_data->nick_name;62 ????????????????$data[‘ali_img‘] ??????= $user_data->avatar;63 ????????????????$data[‘addtime‘] ??????= date("Y-m-d H:i:s", time());64 ????????????????$data[‘person_img‘] ??????= $user_data->avatar;65 ????????????????$data[‘signtime‘] ??????= date("Y-m-d H:i:s", time());66 67 ????????????????$user = M("Member")->where(array("ali_openid"=> $user_data->user_id))->find();68 69 //判断是否是第一次登录70 ????????????????if($user){71 ????????????????????$res = M("Member")->where(array("ali_openid"=> $user_data->user_id))->setField("signtime", date("Y-m-d H:i:s", time()));72 ????????????????????if($res){73 ??????????????????????? //成功登录业务逻辑74 ???????????????????????75 ????????????????????}else{76 ????????????????????????$this->error("操作异常，拒绝访问！", U(‘user/login‘));77 ????????????????????}78 ????????????????}else{79 ????????????????????$res=$m->add($data);80 ????????????????????if($res){81 ??????????????????????? //成功登录业务逻辑82 83 84 ????????????????????}else{85 ????????????????????????$this->error("操作异常，拒绝访问！", U(‘user/login‘));86 ????????????????????}87 ????????????????}88 89 ????????????} else {90 ????????????????$this->error("操作异常，拒绝访问！", U(‘user/login‘));91 ????????????}92 93 ????????}94 ????}php实现支付宝授权登录
原文地址：http://www.cnblogs.com/endv/p/7643765.html