[Mike Garber]

pawn Код:

if (strcmp("/afk", cmdtext, true, 4) == 0)
{
    new name[MAX_PLAYER_NAME], string[128];
    GetPlayerName(playerid, name, sizeof(name));
    format(string, sizeof(string), "%s is Afk,:(.", name);
    SendClientMessageToAll(GREEN, string);
    format(string, sizeof(string),"[AFK]%s", name);
    SetPlayerName(playerid, string);
    return 1;
}

This one IS working There you go
P.S I moved the Message before It sets the name, so It says "3xPloSioNxXx is Afk ." instead of "[AFK]3xPloSioNxXx is Afk ."