We require a PHP class for sorting and inserting items of various size and weight into a list of known 3D spaces.

The class is to accept

1). a list of items with id, size (LxWxH), weight, and two boolean fields.
2). a list of available 3D polygonal spaces.

There are two booleans per item, a). is on floor and b). is stackable.

So, you could sort the floor items best fit first, and layer up the stack. Items that are not stackable go on the very top.
Items of an equal weight or less can only be stacked on top of the one below.

The class is to output an optimised loading list, from the back left floor corner zig-zagging to the top right back corner, then moving forward to the front of the 3D space.

Given that this could be a computationally intensive sort, you may need to thread the program in some way.

All rights to sources to be transferred to me on completion.

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