usort(), uasort() or uksort().  uasort() has a nice little example in the
user comment.

On Sun, 18 Aug 2002, Evan Nemerson wrote:

> I have an array that looks like
> $array = Array(
>       Array($var1, $var2, $var3),
>       Array($var1, $var2, $var3),
>       Array($var1, $var2, $var3)
> );
> I want to sort the arrays within $array by $var3 (although if it helps i can
> easily change that to $var1). $var1 and $var2 are strings, $var3 is a number
> (in form of ([0-9]{3}\.[0-9]) )
> I know i could put something together that would make a new,
> single-dimensional array that looks like Array(var3, var3, var3...), sort
> that, then use that as a reference point, but that's a really sloppy
> approach, and I'm thinking probably not the best way.
> I have a feeling someone is just going to reply with only
> "" in the body of their message, and I'll feel stupid,
> but oh well. I can't find anything in the man.
> Any input would be appreciated.
> -Evan
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