PHP sort()

[darkblade]

It seem that we I sort an array with files with different extensions, it groups the extensions together then sorts them.

Example of a sort array
a.gif
z.gif
b.png
j.png


Does anyone know how to do that?

[nico_swd]

There might be a better way, but this should work.


function extension_sort(&$files)
{
$allfiles = array();

foreach ($files AS $file)
{
$extension = substr(strchr($file, '.'), 1);

$allfiles['name'][] = basename($file, ".{$extension}");
$allfiles['extension'][] = $extension;
}

array_multisort($allfiles['extension'], $allfiles['name']);
$files = array();

foreach ($allfiles['name'] AS $key => $name)
{
$files[] = "{$name}.{$allfiles[extension][$key]}";
}
}


Usage example

$files = array('b.png', 'z.gif', 'j.png', 'a.gif');

extension_sort($files);

print_r($files);

/*
Array
(
[0] => a.gif
[1] => z.gif
[2] => b.png
[3] => j.png
)
*/

[bobby9101]

wouldn't it be better to have it in a two-dimensional array and sort it by extension that way?

[nico_swd]

I think he wants it to sort by extension AND file name.

If you have a better solution, feel free to share. :)

[Robert Plank]

I think he wants it to sort by extension AND file name.

If you have a better solution, feel free to share. :)

k...

<?php

$files = array('a.gif', 'j.png', 'z.gif', 'b.png');

usort($files, 'extSort');

// Sort files by extension, then name
function extSort($first, $second) {

// Match a filename, dot, and extension
$pattern = '/^(.*)\.(.*?)?$/';

if (preg_match($pattern, $first, $firstSet) && preg_match($pattern, $second, $secondSet)) {
list(, $firstName, $firstExt) = $firstSet;
list(, $secondName, $secondExt) = $secondSet;

// If the extensions are equal, sort by name
if ($firstExt == $secondExt) {
return strcmp($firstName, $secondName);
}
// Otherwise, sort by extension
return strcmp($firstExt, $secondExt);
}
return 0;
}

?>