[Logic_]

Don't ever use these kinds of stuff in OnPlayerUpdate, use a timer for that.

PHP код:

// Variables
new acT;
// OnGameModeInit
acT = SetTimer("AntiFly", 1500, true);
// OnGameModeExit
KillTimer(acT);
// function
forward public AntiFly();
public AntiFly()
{
    for(new i, l = GetPlayerPoolSize(); i <= l; i++)
    {
        if(IsPlayerConnected(i))
        {
            //Fly Hack 
            new Float:Pos_x, Float:Pos_y, Float:Pos_z, anim = GetPlayerAnimationIndex(i);
            GetPlayerVelocity(i, Pos_x, Pos_y, Pos_z);
            if(anim == 1008 && GetPlayerWeapon(i) != 46 && (Pos_x <= -0.900000  || Pos_y <= -0.900000 || Pos_z <= -0.900000))
            {
                BanEx(i, "Fly Hack"); // Ban the player with reason Fly Hack
                return 1;
            }
        }
    }
    return 1;
}