[bustern]

The colors needed for your script:

PHP Code:

#define COLOR_WHITE 0xFFFFFFFF
#define COLOR_TEAMCHAT 0x8D8DFFFF 


The command we will use is this:

PHP Code:

CMD:t(playerid, params[])
{
    new string[128];
    if(sscanf(params, "s[128]", params)) return SendClientMessage(playerid, COLOR_WHITE, "[Usage]: (/t)team [text]");
    format(string, sizeof(string), "[Team Chat]%s: %s", RPN(playerid), params);
    SendPlayerTeamMessage(playerid, COLOR_TEAMCHAT, string);
    SetPlayerChatBubble(playerid,params,COLOR_TEAMCHAT,20.0,5000);
    return 1;
} 


Now add this somewhere in your script

PHP Code:

stock SendPlayerTeamMessage(playerid,color, string[])
{
    foreach(Player, i)
    {
        if(gTeam[i] == gTeam[playerid]) //Here i used gteam(You can use PlayerInfo[playerid][Faction/Gang/Fam]
        {
            SendClientMessage(i, color, string);
        }
    }
    return 1;
} 


Also add this somewhere

PHP Code:

stock RPN(playerid)
{
    new name[MAX_PLAYER_NAME];
    GetPlayerName(playerid,name,sizeof(name));
    for(new i = 0; i < MAX_PLAYER_NAME; i++)
    {
        if(name[i] == '_') name[i] = ' ';
    }
    return name;
} 


I hope this will be helpful
If you have questions or problems, just write here.