3d array sorting

I'm trying to sort a three dimensional array but I need help. Here's the setup: I'm parsing an xml document into an array and then automatically outputting the data into a table. I dynamically decide how many columns and rows are in the table depending on the data loaded from the xml document. I'm storing a row using the first array index: $ar[0] I'm storing the column using the second array index: $ar[0][0] I'm storing the specific contents of the column associative third index: $ar[0][0]["value"] I end up with something like this: # row 0, column 0 $ar[0][0]["value"]="00value"; $ar[0][0]["href"]="00href"; $ar[0][0]["nowrap"]="00nowrap"; #row 0, column 1 $ar[0][1]["value"]="01value"; $ar[0][1]["href"]="01href"; $ar[0][1]["nowrap"]="01nowrap"; # row 1, column 0 $ar[1][0]["value"]="10value"; $ar[1][0]["href"]="10href"; $ar[1][0]["nowrap"]="10nowrap"; # row 1, column 1 $ar[1][1]["value"]="11value"; $ar[1][1]["href"]="11href"; $ar[1][1]["nowrap"]="11nowrap"; # row 2, column 0 $ar[2][0]["value"]="20value"; $ar[2][0]["href"]="20href"; $ar[2][0]["nowrap"]="20nowrap"; # row 2, column 1 $ar[2][1]["value"]="21value"; $ar[2][1]["href"]="21href"; $ar[2][1]["nowrap"]="21nowrap"; I can output a table with ease using this array structure. Here's the hitch: HOW DO I SORT THE ARRAY KEEPING THE ROW-COLUMNS TOGETHER BUT SORTING ON A SPECIFIC COLUMN ["value"]? I want to be able to click on the table heading and sort by the heading just like in a Mail program, click on received and the messages are sorted by date received. I repeat, I won't know how rows or columns are in my array until the data is loaded from the xml document. Is there a better way to perform this table sorting? data gathering? I'd appreciate any help. Charles