Sorting an array by a subarray value

[asantos]

I have this array:

[0] => Array
(
[date] => 1300200300
[msg] => Hello!
)

[1] => Array
(
[date] => 1400300400
[msg] => This is cool!
)

[2] => Array
(
[date] => 1200100200
[msg] => No way man!
)

I need the first level array to be ordered by the date value that is in the second level of those arrays.

The final order should be (keys): 2, 0, 1.

Is this feasible? I didnt find any functions or information.

Thanks.

[bkeep]

[us.php.net...] looks like this should do the trick but I can't give you an example as I have never had to use that

[tomda]

It would easier if you can output your array this way

[0] => Array 
( 
[1300200300] => Hello! 
) 
[1] => Array 
( 
[1400300400] => This is cool! 
) 
[2] => Array 
( 
[1200100200] => No way man! 
)

The key of your array being the date (as long as each dates are unique). They sorting your array by key is much easier (I think)

[coopster]

Here are a couple of multi-dimensional array sorting [webmasterworld.com] options you might consider.

[asantos]

Thanks, problem solved!

@bkeep: i investigate a little further about this usort function, and it works great!

@tomda: i cant, there are more items in the subarrays... i just used 2 for this example ;)

@coopster: thank you, that link actually contained the cmp() function i use with the usort() function that bkeep suggested.

Final code:

# Order array by date
function cmp($a,$b) {
if ($a['date'] == $b['date']) return 0;
return ($a['date'] < $b['date'])? -1 : 1;
}

usort($inbox,'cmp');
$inbox = array_reverse($inbox);
print_r($inbox);