How does php obtain the port used by the user to log on to the website?

Php: how to obtain the port title used by the user to log on to the website: php: how to obtain the port used by the user to log on to the website or php: how to obtain the port content used by the user to connect to the server & nbsp; **************************************** * ********** in Baidu, I found out how php can obtain the port used by the user to log on to the website.
Title:
How does php obtain the port used by the user to log on to the website?
Or
How does php obtain the port used by the user to connect to the server?

Content *************************************** ************

I found in Baidu that the $ _ SERVER ['remote _ port'] function can be used to obtain the PORT. I tried it in the local php environment and can obtain my PORT after we log on or exit, but when I move my stuff to my server, I cannot get it. let's help solve it! Thank you !!!





Port? Server Port? Share the user port:
------ Solution --------------------
In earlier versions of IIS, php does not have $ _ SERVER ['remote _ port'] (in Windows 2008 + IIS7.5)
You need to download the REMOTE_PORT patch on the Microsoft website.