I have been experimenting using four character alphanumeric keys on an array,
and when I
generated a random set of keys, and then used ksort to sort the array, I was
very
surprised to find that if the key contained any non-numeric character, or if it
started
with zero, the key was sorted as a base 36 number (0- 9, A-Z, as I expected.
However if
the key only contained numbers, and did not start with zero, it was sorted to
the end of
the list.
Thus:
0000
0009
000A
0999
09A0
ASDF
ZZZZ
1000
9999
I presume this is related to last weeks discussions about casting variables,
but I cannot
understand why 0999 should go to the start of the list, while 1000 goes to the
end. Can
anyone explain this logically?
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