Oops - that doesn't quite make sense. We want to be able to sort on "the 3rd column" or "the 7th row" if it's 2-D; in the case of 3-D, we need to be able to sort on "(the line determined by depth=4 and height=3)". So a better prototype would be:

my_array_sort(my_array,i,j,-,l)

meaning: sort by index k, where the other indices have values of i,j,l respectively)




[Array multisort will work, but only to sort by column; therefore if one wants to sort by ROW, the array must be redesigned].

Sorry the first comment isn't mathematically sensible!

There are many examples and user comments on the manual page for usort() which show how to accomplish this using existing functionality.

http://www.php.net/manual/en/function.usort.php

That's quite true - you can do it. But it's not straightforward, especially when the array has 3 or more dimensions. How about the following:

1)Write a function to do it the way I suggested.

2)Put this in the documentation as a pseudo array-function.

That has the advantages of:
i)Minimum development work required
ii)The function is there as needed (and can be searched for conveniently)
iii)Really good documentation.

Regards

Richard

p.s. My proposal only works when sorting along a line parallel to a cartesian axis of the array. Of course, one could sort according to any line which cuts the n-space of the array - but, while that is more general, its use would be somewhat rare.