[coole210]

It is an if statement. Here's the command (all credits to dracoblue's tut)

pawn Код:

dcmd_register(playerid,params[]) {
  if (PLAYERLIST_authed[playerid]) return SystemMsg(playerid,"Already logged in !");
  if (udb_Exists(PlayerName(playerid))) return SystemMsg(playerid,"Account already exists, please use '/login password'.");
  if (strlen(params)==0) return SystemMsg(playerid,"Correct usage: '/register password'");
  if (udb_Create(PlayerName(playerid),params)) return SystemMsg(playerid,"Account successfully created. Login with '/login password' now.") && SetJob(playerid, 9);
  return true;

 }