Regarding questions about the php client and the server, I understand that the client is executed by the browser, and the server is executed by the server. I am confused. how can I determine whether the code is executed by the browser or by the server ?? Is it because $ _ GET, $ _ POST, $ requests and other uppercase variables are server-side variables? Also, for example, I have asked a question before, that is, about repeated form submission. on CSDN, my friends say that they should write a judgment code on the client, and have doubts about the php client and the server.
I understand that the client is executed by the browser, and the server is executed by the server.
I am confused. how can I determine whether the code is executed by the browser or by the server ??
Is it because $ _ GET, $ _ POST, $ requests and other uppercase variables are server-side variables?
Also, for example, I have asked a question before, that is, about repeated form submission. on CSDN, friends say that they should write a judgment code on the client side, and then write a judgment code on the server side. Although it has been basically solved, I feel that I have only written the client, but I have not figured out what is going on the server.
I don't have any php tutorials. please give me more details. thank you!
------ Solution --------------------
Very simple, The code in the tag is executed by the server, and other codes are interpreted by the browser.
------ Solution --------------------
PHP code is executed on the server.
JavaScript code is executed in a browser.
$ _ GET... $ _ POST is submitted by the client to the server. of course, the server must receive the request.
The server, that is, your php code, and POST data receiving and processing
