[WackoX]

Try this:

pawn Code:

dcmd_a(playerid,params[])
{
    new aName[MAX_PLAYER_NAME],string[128];
    if(pInfo[playerid][pAdmin] < 1) return SendClientMessage(playerid,COLOR_LIGHTYELLOW,"You are not an Administrator with the required level.");
    if(!strlen(params)) return SendClientMessage(playerid,COLOR_LIGHTYELLOW,"[USAGE] ''/a [text]''.");
    
    GetPlayerName(playerid,aName,sizeof(aName));
    format(string,sizeof(string),"[AdminChat]%s: %s",aName,params);
    
    for(new i=0;i<=MAX_PLAYERS<i++;)
    {
      if(pInfo[i][pAdmin] > 0)
        SendClientMessage(i,COLOR_LIGHTBLUE,string);
    }
    return 1;
}