Targeting locations for sorting on a split string in an array?

[Gestahr]

$Booklist array(
"0" => "Abyormenite|Hal|Clement|Cycle of Fire|0|0|1|1|1|2002"
"1" => "Athshean|Ursula K.|Le Guin|The Word for World Is Forest|1|0|2|4|16|2002"
);

I've got about fifty of the above strings packed into an array, the problem I'm having is when it comes to sorting them. Obviously sorting from the first location is as simple as using sort() or asort(), but what if I wanted to sort from say...the third or fourth location in the line, assuming I'm splitting on the "|" symbol? I'm not sure how to target those areas, I've seen certain things that allow performing an action after a certain number of characters, but as you can see, they change from string to string. I'm sure this is something I glossed over in the book I'm reading, but any help would be much obliged. Thanks.

[laserlight]

Maybe you could use explode() to turn the strings into arrays, then use array_multisort() to sort the 2-dimensional array