PHP - sort hash array by key length

Question

I\'ve found a few answers to sorting by value, but not key.

What I\'d like to do is a reverse sort, so with:

    $nametocode[\'reallylongname\']=\'12         


        

Answer 1

I have benchmarked some of sorting algorithms since performance is important for my project - here's what I've found (averaged result ran 1000x, sorted field had cca 300 elements with key size 3-50 chars):

• 2.01 sec ... uksort with anonymous create_function (by cojam)
• 0.28 sec ... array_multisort (by Gumbo)
• 2.69 sec ... uksort with non-anonymous function (by Colin Herbert) - surprise for me,
• 0.15 sec ... simple foreach + arsort

Sometime simple foreach still wins. Using dynamic PHP features has some performance penalty, obviously.