[Jack_Leslie]

Not tested, but as an example for you:

pawn Код:

CMD:gang(playerid, params[])
{
    new gangid;
    if(isnull(params)) return SendClientMessage(playerid, COLOR_SYNTAX, "Syntax: /gang [join/leave]");
    
    if(strcmp(params, "join", true) == 0)
    {
        if(sscanf(params, "i", gangid)) return SendClientMessage(playerid, COLOR_SYNTAX, "Syntax: /gang join [gang id]");
        
        //join...
        return 1;
    }
    else if(strcmp(params, "leave", true) == 0)
    {
        //leave..
    }
    else
    {
        SendClientMessage(playerid, COLOR_SYNTAX, "Syntax: /gang [join/leave]");
    }
    return 1;
}