Sorting an array of dates

[SCook]

Hello,

 

I have an array of dates formatted like: 7/17/2007, now I want to sort them from the most current date tot he furtherest from now, and let's say the array is like this:

dates[0] = 7/17/2007

dates[1] = 7/22/2007

datesp2] = 6/22/2007

dates[3] = 2/22/2008

 

Now, a standard sort() will not work, because it sorts from the beginning of each string.  Any suggestions?  Or an inherit function that might help?  Thanks.

[Caesar]

Convert them all to timestamps then use usort(). Only format dates for display purposes...there's not much benefit to saving them as formatted dates. Will make life easier when it's time to do comparisons or use them in different manners.

[sasa]

try

<?php
function my_dsort($a, $b){
$a = explode('/',$a);
$b = explode('/',$b);
if ($a[2] > $b[2]) return 1;
if ($a[2] < $b[2]) return -1;
if ($a[1] > $b[1]) return 1;
if ($a[1] < $b[1]) return -1;
if ($a[0] > $b[0]) return 1;
if ($a[0] < $b[0]) return -1;
return 0;
}

$dates[0] = '7/17/2007';
$dates[1] = '7/22/2007';
$dates[2] = '6/22/2007';
$dates[3] = '2/22/2008';
shuffle($dates);
print_r($dates);

usort($dates, 'my_dsort');
print_r($dates);

?>

[Barand]

Slightly easier is

 

<?php
$dates[0] = '7/17/2007';
$dates[1] = '7/22/2007';
$dates[2] = '6/22/2007';
$dates[3] = '2/22/2008';

function mysort($a,$b)
{
    $aa = date('Y-m-d',strtotime($a));
    $bb = date('Y-m-d',strtotime($b));
    return strcmp($aa, $bb);
}

usort($dates, 'mysort');

/**
* check
*/
echo '<pre>', print_r($dates, true), '</pre>';
?>