PHP sort()

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?

 

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]}";
	}	
}

PHP:

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
)
*/

PHP:

 

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

 

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;
}

?>

PHP: