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Hello!

Do you mean it like that?

PHP код:

CMD:offcheck(playerid,params[])
{
    new pID;
    if(sscanf(params,"u",pID))return SendClientMessage(playerid,-1,"Use /offcheck [playerid]");
    if(IsPlayerConnected(pID))
    {
        SendClientMessage(playerid,-1,"you cannot use this command on online player");
        return 1;
    }
    //If the player isn't connected
    return 1;
}