usort

I have a usort function with a single line: return 0. I tried to use it on an Array of stdClass objects, and it changes their order, how is that possible? The property you assume is called stability : A stable sorting algorithm will not change the order of elements that are equal. php's sorting functions are not stable (because non-stable sorts may be slightly faster). From the documentation of usort : If two members compare as equal, their order in the sorted array is undefined. If you want a stable sorting algorithm, you must implement it yourself . J0HN It's because that function means "I

I'm using usort to sort an array with an associative array within each element. When all of the values I am sorting on in the array are the same then it still changes the position of the elements in the array, is there a way to prevent this? For example this: array( array('name' => 'Ben', 'authn_weight' => 85.3), array('name' => 'Josh', 'authn_weight' => 85.3), array('name' => 'Fred', 'authn_weight' => 85.3) ); May be changed to this: array( array('name' => 'Josh', 'authn_weight' => 85.3), array('name' => 'Ben', 'authn_weight' => 85.3), array('name' => 'Fred', 'authn_weight' => 85.3) ); This

I am trying to hack a dropdown menu pulling info from an array of countries so that 'United States' (id 1) appears on the top, while every other country is sorted by alphabetical order. How do I sort all EXCEPT United States to remain on top, using usort function for an array? Any alternative suggestions are also welcome. Here is the code: while (list($key, $value) = each($countries->countries)) { $countries_array[] = array('id' => $key, 'text' => $value['countryname']); } function text_cmp($a, $b) { return strcmp($a["text"], $b["text"]); } usort($countries_array, 'text_cmp'); The easiest way

I am sorting & grouping publication data from an XML file. The methods I am currently using are working fine for the most part , although I feel like there is a more efficient way to do what I am trying to accomplish. Here is a sample of what the target nodes look like: <comic> <id>117</id> <mainsection> <series> <displayname>My Amazing Adventure</displayname> <sortname>My Amazing Adventure</sortname> </series> </mainsection> <issuenr>2</issuenr> <seriefirstletter> <displayname>M</displayname> <sortname>M</sortname> </seriefirstletter> </comic> Here are the current steps I am taking. Loading

I think I might have read every usort article on StackOverflow, but I can't work out this one. It might be that usort is not the tool I need? Here's a bit of the array that I'm working with (I have it assigned to $allPages ): Array ( [0] => Page Object ( [id] => 4 [slug] => articles [created_on] => 2009-08-06 07:16:00 ) [1] => Page Object ( [id] => 99 [slug] => a-brief-history [created_on] => 2011-04-25 12:07:26 ) [2] => Page Object ( [id] => 98 [slug] => we-arrive [created_on] => 2011-04-24 13:52:35 ) [3] => Page Object ( [id] => 83 [slug] => new-year [created_on] => 2011-01-02 14:05:12 ) ) I