check box after submitting the client ticked content, how the server side avoids the client-submitted check of the selected query

After the check box submits the client tick, how does the server handle the checked query submitted by the client?


For example, I checked the 1,4,5.
How to get to 1,4,5 on the server side and query out the various types of large and small number each.
The fields of the database are the kid,lb,xh inside the table, where the model is only large, medium, and three values.

Also, how to tick submit data after paging.
For example, I checked the first page of 1,4,5 three, the second page tick, 8,9,12 three, because the paging, you need to turn the page tick, flip the page after the selection of how to submit data, please expert guidance.

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------Solution--------------------
$kid =join (', ', $_post[' kid ')
$sql = "SELECT * from table where kid in ($kid)";

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