[jlalt]

try this function, also use char var in it so you will save more memory usage.
also you don't need "stock" in this function.

PHP Code:

new SpamCount[MAX_PLAYERS char], ChatSpamTime[MAX_PLAYERS char];
AntiSpam(playerid)
{
    new msg[145];
    if((gettime()-ChatSpamTime{playerid}) > 5 || !ChatSpamTime{playerid})
    {
        SpamCount{playerid} = 1;
        ChatSpamTime{playerid} = gettime();
    }
    else
    {
        SpamCount{playerid}++;
        switch(SpamCount{playerid})
        {
            case 2:
            {
                ChatSpamTime{playerid} = gettime(); // <- update the time!
            }
            case 3:
            {
                SendClientMessage(playerid, 0xFFFFFF, "[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);
                ChatSpamTime{playerid} = gettime();
            }
            case 4..99:
            {
                format(msg, sizeof(msg), "[Anti-Spam]: %s has been muted for 5 minutes! (Reason: Spam)", GetName(playerid));
                SendClientMessageToAll(0xFFFFFF, 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);
                ChatSpamTime{playerid} = 0;
                SpamCount{playerid} = 0;
            }
        }
    }
    return 1;
} 


Char: https://sampwiki.blast.hk/wiki/Keywords:Operators#char
Stock: https://sampforum.blast.hk/showthread.php?tid=570635

also be sure to do

PHP Code:

    ChatSpamTime{playerid} = 0;
    SpamCount{playerid} = 0; 


at onplayerconnect callback.