[maksicnm]

new string[256];
format(string, sizeof(string), "Welcome %s to server!", GetName(playerid));
SendClientMessage(playerid, -1, string);

So, here is the stock GetName:
stock GetName(playerid)

Код HTML:

{
    new name[MAX_PLAYER_NAME];
    GetPlayerName(playerid, name, sizeof(name));
    return name;
}