[Konstantinos]

pawn Код:

// global:
new gPlayer_Name[MAX_PLAYERS][MAX_PLAYER_NAME];

#define PlayerName(%0) gPlayer_Name[%0]

// OnPlayerConnect:
GetPlayerName(playerid, gPlayer_Name[playerid], MAX_PLAYER_NAME);

instead of calling the GetPlayerName function over and over again (with a function).

Oh and make sure that the player is connected before using it otherwise it'll cause run time error 4: Array index out of bounds.