[Threshold]

chars are only really used when you know the value is going to be between 0 and 255. So yeah, shouldn't be used for functions like gettime.

Small improvements:

PHP Code:

new SpamCount[MAX_PLAYERS char], ChatSpamTime[MAX_PLAYERS];

AntiSpam(playerid)
{
    new time = gettime();
    if((time - ChatSpamTime[playerid]) < 5 || !ChatSpamTime[playerid])
    {
        ChatSpamTime[playerid] = time;
        switch(++SpamCount{playerid})
        {
            case 3:
            {
                new msg[75];
                SendClientMessage(playerid, 0xFFFFFFFF, "[Anti-Spam]: Warning you are one message away from being muted!");
                format(msg, sizeof(msg), "[Flood Control] - %s has been warned for flooding", GetName(playerid));
                ABroadCast(COLOR_ADMIN, msg, 1);
            }
            case 4:
            {
                new msg[75];
                format(msg, sizeof(msg), "[Anti-Spam]: %s has been muted for 5 minutes! (Reason: Spam)", GetName(playerid));
                SendClientMessageToAll(0xFFFFFFFF, msg);
                SendClientMessage(playerid, COLOR_GREEN, "You have received your final warning! You are now muted");
                PlayerInfo[playerid][muted] = 1;
                print(msg);
                SetTimerEx("AutoUnMute", AutoUnmuteTime * 60000, false, "i", playerid);
                SpamCount{playerid} = 0;
                return 0;
            }
        }
    }
    else
    {
        SpamCount{playerid} = 0;
        ChatSpamTime[playerid] = time;
    }
    return 1;
}

public OnPlayerText(playerid, text[])
{
    if(!AntiSpam(playerid)) return 0;
    // Rest of OnPlayerText...
}