微信授权接口封装

//获取微信授权
function getOpenidDirectly($scope = 'snsapi_base'){
    $appid     =   C('APPID');
    $secret        =   C('APPSECRET');
    $host      =   C('HOST');
    $code		=	isset($_REQUEST['code'])?$_REQUEST['code']:'';
    $state		=	isset($_REQUEST['state'])?$_REQUEST['state']:'';
    //获取当前完整url
    $redirect_uri	=	$host.$_SERVER['REQUEST_URI'];
    $redirect_uri	=	UrlUnsetParam(array('code','scope','state'), $redirect_uri);

    if(!$code || $scope != $state){
        getWeixinCode($scope, $redirect_uri);
    }else{
        if($state=='snsapi_base'){
            $openid = 	getOpenid($code);
            if(!$openid){ //如果没取成功则再去取，直到取到为止
                getWeixinCode('snsapi_base',$redirect_uri);
            }
        }else if($state=='snsapi_userinfo'){
            $url 	= 	"https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$appid."&secret=".$secret."&code=".$code."&grant_type=authorization_code";
            $return =	curl_post_json($url);
            $return = 	json_decode($return);
            //echo '<pre>';print_r($return);exit('ddd');
            return $return;
        }
    }

    return $openid;
}


function getWeixinCode($snsaiptype,$redirect_uri){
    $appid     =   C('APPID');
    $secret        =   C('APPSECRET');
    $host      =   C('HOST');
    //获取code
    //$redirect_uri    =   urlencode(get_url());
    if(!$redirect_uri){
        $redirect_uri	=	$host.$_SERVER['REQUEST_URI'];
    }
    $redirect_uri	=	urlencode($redirect_uri);
    $get_code 		= 	"https://open.weixin.qq.com/connect/oauth2/authorize?appid=".$appid."&redirect_uri=".$redirect_uri."&response_type=code&scope=".$snsaiptype."&state=".$snsaiptype."#wechat_redirect ";
    header("location:$get_code");
    exit;
}

//获取Openid
function getOpenid($code){
    $appid     =   C('APPID');
    $secret        =   C('APPSECRET');
    $url 		= 	"https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$appid."&secret=".$secret."&code=".$code."&grant_type=authorization_code";
    $return 	=	curl_post_json($url);
    $return 	= 	json_decode($return);
    return $return->openid;
}


//获取用户信息
function getAuthUserInfo($token, $openid,$lang='zh_CN'){
    $url 			= "https://api.weixin.qq.com/sns/userinfo?access_token=".$token."&openid=".$openid."&lang=".$lang;
    $weixinUserinfo	=	curl_post_json($url);
    $return 		= json_decode($weixinUserinfo);
    return $return;
}

//去掉URL中的参数
function UrlUnsetParam($paramArray,$url) {
    if($paramArray){
        foreach ($paramArray as $val){
            $url   =   preg_replace(
                    array("/{$val}=[^&]*/i", '/[&]+/', '/\?[&]+/', '/[?&]+$/',),
                    array('', '&', '?','',),
                    $url
            );
        }
    }
    return $url;
}