Use overlap to switch once when stepped on tile, but overlap keeps firing

[BdR]

I'm working on an action game where the player can touch certain switch tiles to turn other enemies off and back on. So the way it is supposed to work is like this:

1. The player overlaps a switch tile
2. Execute the switch action only once
3. Ignore further overlapping with that tile until player moves off
4. When player moves off the switch should wait for the next overlap
5. Repeat from step 1 when player overlaps again

I'm using arcade physics and the overlap function and it's working.. sort of. The problem is, the overlap keeps firing over and over again. What would be the best way in Phaser to get the desired result?

See screenshot below of what I mean, and I've created a sandox of my code example here:
https://phaser.io/sandbox/edit/zEVOQfgA

[BdR]

I've been playing around some more and stumbled on a solution.  The trick is to use 2 global variables. One to check if there is an overlap, and one to see if the switch action was already done. Then it can all be handled in the update() function.

function update() {
    // assume no overlap
    frameoverlap = 0;

    // do arcade.overlap
    game.physics.arcade.overlap(mushroom, theswitch, handleCollide, null, this);
	
    // check flags after arcade.overlap
    if (frameoverlap == 1) {
        if (doswitch == 0) {
            doswitch = 1; // remember the switch was done
            doSwitch();
        }
    } else {
        if (doswitch == 1) {
            doswitch = 0; // stepping off the switch tile
        }
    }
}

See updated code here
https://phaser.io/sandbox/edit/VTenTwgh