PHP sort mutlidim array usort not working

Question

Hi I need to sort an array by date:

This is my array $get:

Array ( 
    [0] => Array ( 
        [Date] => 02.06.2012 
        [Theme] => test 
    ) 
    [1] => Array ( 
        [Date] => 03.07.2012 
        [Theme] => lol 
    ) 
    [2] => Array ( 
        [Date] => 09.06.2012 
        [Theme] => hm 
    ) 
)

I tried following code:

function date_sort($a, $b) {
  return strcmp($a['Date'], $b['Date']);
}

usort($get, 'date_sort');

But all I get is unordered dates. My date is set dd.mm.yyyy!

Andreas Wong · Accepted Answer · 2012-06-02 00:24:42Z

2

Try doing

function date_sort($a, $b) {
    return strtotime($a['Date']) - strtotime($b['Date']);
}

answered Jun 2, 2012 at 0:24

Andreas Wong

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2 Comments

Spudley Over a year ago

strtotime() in a usort callback function? that's going to be sloooooow if you've got a lot of elements to sort. Better to run through the array first and populate an extra element with the converted date; then the sort will be much quicker.

Spudley Over a year ago

also, be careful with strtotime() -- it makes assumptions about whether a date is dd mm yyyy or mm dd yyyy; read the manual page and make sure your dates aren't going to be converted incorrectly.

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