1 system.api.php hook_stream_wrappers()

Registers PHP stream wrapper implementations associated with a module.

Provide a facility for managing and querying user-defined stream wrappers in PHP. PHP's internal stream_get_wrappers() doesn't return the class registered to handle a stream, which we need to be able to find the handler for class instantiation.

If a module registers a scheme that is already registered with PHP, it will be unregistered and replaced with the specified class.

Return value

A nested array, keyed first by scheme name ("public" for "public://"),: then keyed by the following values:

See also




Related topics


core/modules/system/system.api.php, line 2096
Hooks provided by Backdrop core and the System module.


function hook_stream_wrappers() {
  return array(
    'public' => array(
      'name' => t('Public files'),
      'class' => 'BackdropPublicStreamWrapper',
      'description' => t('Public local files served by the webserver'),
    'private' => array(
      'name' => t('Private files'),
      'class' => 'BackdropPrivateStreamWrapper',
      'description' => t('Private local files served by Backdrop'),
    'temp' => array(
      'name' => t('Temporary files'),
      'class' => 'BackdropTempStreamWrapper',
      'description' => t('Temporary local files for upload and previews'),
    'cdn' => array(
      'name' => t('Content delivery network files'),
      'class' => 'MyModuleCDNStreamWrapper',
      'description' => t('Files served by a content delivery network'),
      // 'type' can be omitted to use the default of STREAM_WRAPPERS_NORMAL
    'youtube' => array(
      'name' => t('YouTube video'),
      'class' => 'MyModuleYouTubeStreamWrapper',
      'description' => t('Video streamed from YouTube'),
      // A module implementing YouTube integration may decide to support using
      // the YouTube API for uploading video, but here, we assume that this
      // particular module only supports playing YouTube video.