After the check box is submitted to the client, how does the server avoid the checked query submitted by the client?

After the check box is submitted to the client, how does the server process the checked query submitted by the client? For example, I checked, 5, and how to get, 5 on the server, and found the number of large, medium, and small models. The database field is the kid, lb, xh & nbsp in the table. The model contains only three values: large, medium, and small. Also, how do I check and submit data after paging. For example, after I check the box to submit the content selected by the client, how does the server handle the query selected by the client?


For example, if I select, 5
On the server side, how can I obtain products, 5, and how many other models are available.
The database field is the kid, lb, and xh values in the table. The model contains only three values: large, medium, and small.

Also, how do I check and submit data after paging.
For example, on the first page, I checked 3, 4, 5, and 3, 8, 9, and 12 on the second page. because the page is displayed, I need to check the page and how to submit the data after checking the page, please kindly advise ..

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------ Solution --------------------
$ Kid = join (',', $ _ POST ['kid'])
$ SQL = "select * from table where kid in ($ kid )";