Hello, and welcome, code explorer! Today's journey takes us through the intricate paths within a 2-dimensional array, often likened to a game board. Our mission is to identify ideal spots for game piece placement. Sounds like an adventure, doesn't it? Let's embark!

Visualize a chessboard in the form of a 2D array, where each cell could be marked 'E' for empty or 'P' for a piece. Our quest involves summoning a PHP function named findPositions(). Upon examining this 2D array, this function identifies all the spots where a new piece could be placed so that it can move to another empty cell in one move. The catch is that a piece can move only to an immediately neighboring cell directly above, below, to the left, or right, but not diagonally.

Consider this 4x4 board, for instance:

The function should output the following pairs representing positions: (0, 1), (0, 2), (1, 2), (2, 1), (3, 1). This output represents the positions where a new piece can fit perfectly and then be able to move in the next turn.

Stepping right into action, we start with an empty positions array to help us log the sought-after positions. Understanding the dimensions of our "board" paves the way for defining boundaries in our exploration mission. In PHP, we determine the size of a 2D array using the count() function.