Prefixes all paths within a CSS file for drupal_build_css_cache().
function _drupal_build_css_path($matches, $base = NULL) {
$_base =& drupal_static(__FUNCTION__);
// Store base path for preg_replace_callback.
if (isset($base)) {
$_base = $base;
}
// Prefix with base and remove '../' segments where possible.
$path = $_base . $matches[1];
$last = '';
while ($path != $last) {
$last = $path;
$path = preg_replace('`(^|/)(?!\\.\\./)([^/]+)/\\.\\./`', '$1', $path);
}
return 'url(' . file_create_url($path) . ')';
}