template.php

<?php

function orchid_preprocess_page(&$variables) {
  _orchid_conditional_stylesheets($variables);
}

function _orchid_conditional_stylesheets(&$variables) {
  $themes = list_themes();
  $theme = $GLOBALS['theme'];
  $query_string = substr(variable_get('css_js_query_string', '0'), 0, 1);
  $theme_path = drupal_get_path('theme', 'orchid');

  $conditional_stylesheets = $themes[$theme]->info['conditional-stylesheets'];
  foreach ($conditional_stylesheets as $condition => $css) {
    foreach ($css as $media => $files) {
      foreach ($files as $file_path) {
        $stylesheet_path = url(sprintf('%s/%s', $theme_path, $file_path), array('query' => $query_string));
        if (file_exists(".$stylesheet_path")) {
          $conditional_stylesheet = <<<DOC
<!--[$condition]>
<link type="text/css" rel="stylesheet" media="$media" href="$stylesheet_path" />
<![endif]-->
DOC;
          $variables['conditional_styles'] .= $conditional_stylesheet;
        }
      }
    }
  }

  kpr($variables['conditional_styles']);
}