Urgent, md5 issue in php, online, etc. thanks

Urgent, md5 issue in php, online, etc. thanks to md5_file for remote file md5 retrieval

In php, md5_file is obtained locally. do you need to obtain the md5 of a remote file? And then determine whether or not to modify...
If you have any cases or documents, please give us some advice... Thanks

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Read it and try md5 again ...... Are there other possibilities?

Read it and try md5 again ...... Are there other possibilities?

Because the data is stored on a third-party server, it is necessary to verify whether the file has been modified on the other server.

Read it and try md5 again ...... Are there other possibilities?

Because the data is stored on a third-party server, it is necessary to verify whether the file has been modified on the other server.

Is it better for the other party to output an md5 file to you? What else?

If the server is controllable, it is md5 on the server.
The modify time is not controllable, and the time is obtained after the specified time.

I tried. I just thought about it. either send a request to the server, the server will perform MD5 and then return the result or download the MD5