[Inn0cent]

Try this,

Code:

if(SpamCheckT(playerid, 2) == 1)
{  
	SpamTimes[playerid]++;  
	if(SpamTimes[playerid] == 5)   
	{  
		PlayerData[playerid][Muted] = 1;  
		PlayerData[playerid][MutedTime] += 20;  
		new str[128]; // blah blah  
		mysql_format(SQL, str,128,"UPDATE `users` SET `Muted`='1' ,`MutedTime`='%d' WHERE `id` = '%d' LIMIT 1",PlayerData[playerid][MutedTime],PlayerData[playerid][ID]);  
		mysql_tquery(SQL, str, "", "");  
		SendClientMessage(playerid, COLOR_GREY, "You have been auto-muted for spamming. You will be unmuted in 20 seconds.");      
		SpamTimes[playerid] = 0; 
		return 0;    
	}   
} else SpamTimes[playerid] = 0;

Add this somewhere in your script

PHP Code:

stock SpamCheckT(playerid, time)
{
    new time_spam = gettime() - SpamCheck[playerid];
    if(time_spam < time) return 1;
    SpamCheck[playerid] = gettime();
    return 0;
}