Group Drupal CSS

gistfile1.php

<?php

/**
 * Implements hook_css_alter().
 */
function mymodule_css_alter(&$css) {
  uasort($css, 'drupal_sort_css_js');
  $i = 0;
  foreach ($css as $name => $style) {
    $css[$name]['weight'] = $i++;
    $css[$name]['group'] = CSS_DEFAULT;
    $css[$name]['every_page'] = FALSE;
  }
}

?>

<?php
//if you have more than 4095 selectors here's the method to make two sheets for IE 8

uasort($css, 'drupal_sort_css_js');
$i = 0;
foreach ($css as $name => $style) {
  $css[$name]['weight'] = $i++;
  // Break grouping into two sets - CSS_SYSTEM, (-100) and the rest
  if ($style['group'] == -100) {
    $css[$name]['group'] = CSS_SYSTEM;
  }
  else {
    $css[$name]['group'] = CSS_DEFAULT;
  }
  $css[$name]['every_page'] = FALSE;
}

?>