1 common.inc backdrop_get_library($module, $name = NULL)

Retrieves information for a JavaScript/CSS library.

Library information is statically cached. Libraries are keyed by module for several reasons:

  • Libraries are not unique. Multiple modules might ship with the same library in a different version or variant. This registry cannot (and does not attempt to) prevent library conflicts.
  • Modules implementing and thereby depending on a library that is registered by another module can only rely on that module's library.
  • Two (or more) modules can still register the same library and use it without conflicts in case the libraries are loaded on certain pages only.

@todo The purpose of backdrop_get_*() is completely different to other page requisite API functions; find and use a different name.


$module: The name of a module that registered a library.

$name: (optional) The name of a registered library to retrieve. By default, all libraries registered by $module are returned.

Return value

The definition of the requested library, if $name was passed and it exists,: or FALSE if it does not exist. If no $name was passed, an associative array of libraries registered by $module is returned (which may be empty).

See also





core/includes/common.inc, line 5495
Common functions that many Backdrop modules will need to reference.


function backdrop_get_library($module, $name = NULL) {
  $libraries = &backdrop_static(__FUNCTION__, array());

  if (!isset($libraries[$module])) {
    // Retrieve all libraries associated with the module.
    $module_libraries = module_invoke($module, 'library_info');
    if (empty($module_libraries)) {
      $module_libraries = array();
    // Allow modules to alter the module's registered libraries.
    backdrop_alter('library_info', $module_libraries, $module);

    foreach ($module_libraries as $key => $data) {
      if (is_array($data)) {
        // Add default elements to allow for easier processing.
        $module_libraries[$key] += array(
          'dependencies' => array(),
          'js' => array(),
          'css' => array(),
          'icons' => array(),
        foreach ($module_libraries[$key]['js'] as $file => $options) {
          $module_libraries[$key]['js'][$file]['version'] = $module_libraries[$key]['version'];
    $libraries[$module] = $module_libraries;
  if (isset($name)) {
    if (!isset($libraries[$module][$name])) {
      $libraries[$module][$name] = FALSE;
    return $libraries[$module][$name];
  return $libraries[$module];