[HELP]Executing function once with handler

[darul360]

Hi, i have a trouble with my fuction . It's simply trigerred by hiting marker but the clue is that i want it to be trigerred ONLY ONCE like "onceTrigerredonMarkerHit".
My code as an example  :

marker2=createMarker(3399.2,-1899.2,30.1,"corona",2,0,0,255,0)
tr1=createVehicle(584,3357.5,-1956.8,31.29,0,0,90)
tr2=createVehicle(515,3347.2,-1957,31.29,0,0,90)

function open_smashb()
...
function m()
...
blowVehicle(tr)
blowVehicle(tr2)
end
setTimer(m,2000,1)
end
	addEventHandler("onMarkerHit", marker2, open_smashb) 

 

[DRW]

marker2=createMarker(3399.2,-1899.2,30.1,"corona",2,0,0,255,0)
tr1=createVehicle(584,3357.5,-1956.8,31.29,0,0,90)
tr2=createVehicle(515,3347.2,-1957,31.29,0,0,90)
local markeractive = false

function m()
  blowVehicle(tr)
  blowVehicle(tr2)
  local markeractive = true
end

function open_smashb()
  if not markeractive then
    setTimer(m,2000,1)
  end
end
addEventHandler("onMarkerHit", marker2, open_smashb)