Hi! So I'm very new to Pico-8 and recently purchased Pico-8 to test my skills in coding and currently I'm having problems trying to find collision. My Current Code is shown below:

function update_game()

 if fget(2,0) then
  --wall
 else 
  if btnp(⬅️) then
   p_x-=1

  end
  if btnp(➡️) then
   p_x+=1
  end
  if btnp(⬆️) then
   p_y-=1
  end
  if btnp(⬇️) then
   p_y+=1
  end
 end
end

To describe my problem, I currently can go through any wall I want to, and it still moves.