GetPlayerId v1.0 © 2013 Sydcul

GetPlayerId(player[]) { // GetPlayer checks if the input is a player id / name, and outputs the player id, or INVALID_PLAYER_ID if the input was invalid. © Sydcul. All rights reserved.
    new playerid = -1, playername[MAX_PLAYER_NAME+1], numeric = 1;

    if(IsPlayerConnected(strval(player))) {
        for (new i = 0, j = strlen(player); i < j; i++)
        {
           if (player[i] > '9' || player[i] < '0') {
                numeric = 0;
           }
        }
        if(numeric == 1) {
            GetPlayerName(strval(player), playername, sizeof(playername));
            playerid = strval(player);
        } else {
            for(new i = 0; i < MAX_PLAYERS; i++)
            {
                if(IsPlayerConnected(i)) {
                    GetPlayerName(i, playername, sizeof(playername));
                    if(!strcmp(player, playername, true)) {
                        playerid = i;
                        break;
                    }
                }
            }
        }
    }
    if(playerid >= 0) {
        return playerid;
    } else {
        return INVALID_PLAYER_ID;
    }
}