A brief discussion on cross-domain issues in PHP

The content of this article is about the cross-domain issues of PHP. Now I will share it with you. Friends in need can refer to it

Let’s talk about the simplest example first

First The code on the server

public function kuayu(){
    header("Access-Control-Allow-Origin: http://baidu.com"); //说明是允许百度访问你的服务器
    return json(['status'=>0,'msg'=>1231]);
}

Access-Control-Allow-Origin:加上你请求该服务器的域名

如果要允许所有的服务器访问的话就只需要一个*,例如Access-Control-Allow-Origin:*

Finally the code on the client

$.ajax({
    url:'http://xxx.com/kuayu',这里填写你所访问的链接
    async:false,
       success:function(res){
       console.log(res);
    }
})

最后就完成了简单的跨域请求

Let’s briefly talk about jsonp cross-domain (due to the blogger’s theory I don’t have solid knowledge, so I can only post the code, haha)

First go to the server-side code

public function kuayu(){
    return input('get.callback')."(".json_encode(['status'=>0,'msg'=>1231]).")";
}

Client-side code

$.ajax({
    url:'http://www.xx.cn/kuayu',
    dataType:'jsonp',固定写法
    jsonp:'callback',固定写法
    success:function(res){
        console.log(res);
    }
})

There is a pitfall in this, that is, the server returns The format of the data must be as follows

jQuery111307920822086038766_1523501176244({"status":0,"msg":1231})

The big string in front is generated by the system, or it can be customized

So the return data from the server must be $_GET['callback']. (Data) This format is like this

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