[Shinja]

PHP Code:

CMD:h(playerid, params[])
{
    new tmp[50]
     if(sscanf(params, "s[5]", tmp)) return SendClientMessage(playerid, -1, "{0008F7}USAGE: {FFFFFF}/H [BUY/SELL]");
    if(strcmp(tmp, "BUY") && strcmp(tmp, "SELL")) return SendClientMessage(playerid, -1, "{0008F7}USAGE: {FFFFFF}/H [BUY/SELL]");
    if(!strcmp(tmp, "BUY"))
    {
        //buy
    }
    if(!strcmp(tmp, "SELL"))
    {
        //sell
    }
    return 1;
}