How to achieve data sharing between different domain names in php

In the current Web development environment, different applications run under different domain names, which results in the inability to directly share data between applications with different domain names. In this case, how to achieve data sharing between different domain names? This article will introduce a PHP-based solution.

1. Front-end cross-domain

In the current Web development environment, "cross-domain" is a common problem. When a user's browser requests resources from a server with a different domain name, the target server may reject these requests due to the browser's same-origin policy. This leads to cross-domain problems when the front end calls API interface data under different domain names.

There are many ways to solve this problem, such as JSONP, CORS, etc. However, these methods are all designed to solve front-end cross-domain problems and cannot be used to achieve data sharing between different domain names.

2. Back-end cross-domain solution

1. Use HTTP protocol to achieve data sharing

HTTP protocol is a stateless protocol. But it provides a mechanism called "Cookies" that allows the server to save data on the client browser for session tracking. When a user logs in under one domain name, other domain names can share data through cookies.

2. Use URL parameters to achieve data sharing

URL parameters are another common way of data sharing. Adding parameters to the URL enables data transfer between different domain names. However, this method is not suitable for passing sensitive data because the parameters in the URL can be intercepted and viewed by others.

3. Use shared memory to achieve data sharing

Shared memory is a way to share data between processes, which allows different processes to access the same memory space. Shared memory can be used to share data between different domain names, but in practice, care needs to be taken to avoid data security issues.

4. Use database to achieve data sharing

Using database is a very common way of data sharing. Under different domain names, data can be stored on the same database server to achieve data sharing.

3. Domain name data sharing based on PHP

In PHP, it is very simple to use the HTTP protocol and Cookie mechanism to achieve data sharing between different domain names. The specific implementation method is as follows:

1. Set Cookie under the main domain name

//设置cookie时，将域名设置为主域名
setcookie('name', 'value', time()+3600, '/', 'example.com');

2. Use Cookie under other domain names

//通过$_COOKIE来获取数据
echo $_COOKIE['name'];

The reason why this method is feasible is that using When PHP sets a cookie, you can set the domain name as the main domain name so that it can also be used under subdomain names. The browser's same-origin policy only prevents JavaScript scripts between different domain names from accessing cookies under different domain names, but does not prevent cookie sharing between servers.

In addition, it should be noted that when sharing data, the security and integrity of the data need to be ensured to avoid the leakage of sensitive data. At the same time, it is necessary to ensure the consistency of data to avoid malicious tampering of data that will affect the normal operation of other applications.

Conclusion

This article introduces the problem of data sharing between different domain names and its solutions. Among them, the data sharing method based on HTTP protocol and Cookie mechanism is very simple and effective, and it is also easy to implement in PHP. Of course, when sharing data, it is necessary to ensure the security and integrity of the data and avoid malicious tampering of the data. At the same time, it is necessary to comply with relevant laws and regulations to ensure the legality and compliance of data.

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