sorting multiple-dimensional arrays

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 "php.net/somefunction" 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