[BlackFoX]

It is only one Variable that you set to 1 or 0 , so you can create if Statement and
check for value , if its is 1 block the cmd

Код:

if(value == 1)return SendClientMessage(...);

but you must Create Variable for every Player ( Max_Players )

new value[MAX_PLAYERS];

dont forget to Reset Variable if Player is leaving the Server ...