[TzAkS.]

Make a variable and add it to a command ex:

Код:

new Variable[MAX_PLAYERS];

Код:

if (strcmp("/cmd", cmdtext, true, 10) == 0)
{
if(Variable[playerid] == 3)
{
SendClientMessage(playerid, -1, "You can use this command just 3 times");
}
//do something
Variable[playerid] += 1;
}

This is just an example.