How much do you know about short address restoration?

The example in this article describes how to simply implement short URL restoration in PHP. Share it with everyone for your reference, the details are as follows:

People who often surf the Internet must have seen many URL links compressed by URL shortening services, such as this http://bit.ly/5GtDeI. The advantage of shortening a URL is that it can compress a very long URL into a very short one, and the web page pointed to by the link remains unchanged after the jump. It is especially suitable for use on microblogs with a limited word count such as Twitter; or when encountering the file download address of Xunlei, For extremely long links like eMule's eD2k link, it's also good to use a URL shortening service to compress them below.
However, after the link compressed by the URL shortening service, we cannot see which web page it points to. We have to click on it. What if it is a rogue site? And don’t forget the four words “Chinese characteristics”. The world’s most popular URL shortening service “bit.ly” is blocked in China. In other words, even if the original website has not been harmonized, many URLs such as bit.ly are blocked. The shortening service provider
has been blocked, the short link cannot be redirected, and we still cannot open the web page (冏Bar).

How to check the real address of the short link of URL shortening service such as bit.ly untr.im extremely simple interface The solution is to find a service that reversely restores the short URL and get the original long link URL back. You can go to http://bitly.co/, enter the shortened URL in the box, such as this http://bit.ly/xxxxxx, and click the "Restore" button to get the real URL before it was shortened. Address.

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