Keep player from falling outside the camera? [2d]

So I’m creating a simple 2d game with a fixed camera!

Is there an easy way to keep my player, who has physics attached to him,
from falling outside of the cameras views?

Currently I just have 4 walls surrounding the borders of the camera.

Just wondering if there is a better way to do this!

-thanks!

Hey I figured this out,
If anyone else wants a simple way to keep objects
from falling out of the cameras view no matter what the screen size
then here you go:

#pragma strict

//Reference the camera
var mainCam : Camera;

//Reference the colliders we are going to adjust
var topWall : BoxCollider2D;
var bottomWall : BoxCollider2D;
var leftWall : BoxCollider2D;
var rightWall : BoxCollider2D;

function Start () { //Only set this to Update if you know the screen size can change during a playsession.

	//Move each wall to its edge location:
	topWall.size = new Vector2 (mainCam.ScreenToWorldPoint (new Vector3 (Screen.width * 2f, 0f, 0f)).x, 1f);
	topWall.center = new Vector2 (0f, mainCam.ScreenToWorldPoint (new Vector3 ( 0f, Screen.height, 0f)).y + 0.5f);
	
	bottomWall.size = new Vector2 (mainCam.ScreenToWorldPoint (new Vector3 (Screen.width * 2, 0f, 0f)).x, 1f);
	bottomWall.center = new Vector2 (0f, mainCam.ScreenToWorldPoint (new Vector3( 0f, 0f, 0f)).y - 0.5f);
	
	leftWall.size = new Vector2(1f, mainCam.ScreenToWorldPoint(new Vector3(0f, Screen.height*2f, 0f)).y);;
	leftWall.center = new Vector2(mainCam.ScreenToWorldPoint(new Vector3(0f, 0f, 0f)).x - 0.5f, 0f);
	
	rightWall.size = new Vector2(1f, mainCam.ScreenToWorldPoint(new Vector3(0f, Screen.height*2f, 0f)).y);
	rightWall.center = new Vector2(mainCam.ScreenToWorldPoint(new Vector3(Screen.width, 0f, 0f)).x + 0.5f, 0f);
}

Courtesy of brackeys.com

Just make sure to create 4 empty game objects then
add box colliders to them (box collider 2d in my case).

then link them up to the script.
(I put the script on a different empty game object)