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:

• 'name' A short string to name the wrapper.
• 'class' A string specifying the PHP class that implements the DrupalStreamWrapperInterface interface.
• 'description' A string with a short description of what the wrapper does.
• 'type' (Optional) A bitmask of flags indicating what type of streams this wrapper will access - local or remote, readable and/or writeable, etc. Many shortcut constants are defined in stream_wrappers.inc. Defaults to STREAM_WRAPPERS_NORMAL which includes all of these bit flags:
  • STREAM_WRAPPERS_READ
  • STREAM_WRAPPERS_WRITE
  • STREAM_WRAPPERS_VISIBLE

See also

file_get_stream_wrappers()

hook_stream_wrappers_alter()

system_stream_wrappers()

Related topics

File

drupal-7.x/modules/system/system.api.php, line 2691

Hooks provided by Drupal core and the System module.

Code

function hook_stream_wrappers() {
  return array(
    'public' => array(
      'name' => t('Public files'),
      'class' => 'DrupalPublicStreamWrapper',
      'description' => t('Public local files served by the webserver.'),
      'type' => STREAM_WRAPPERS_LOCAL_NORMAL,
    ),
    'private' => array(
      'name' => t('Private files'),
      'class' => 'DrupalPrivateStreamWrapper',
      'description' => t('Private local files served by Drupal.'),
      'type' => STREAM_WRAPPERS_LOCAL_NORMAL,
    ),
    'temp' => array(
      'name' => t('Temporary files'),
      'class' => 'DrupalTempStreamWrapper',
      'description' => t('Temporary local files for upload and previews.'),
      'type' => STREAM_WRAPPERS_LOCAL_HIDDEN,
    ),
    '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.
      'type' => STREAM_WRAPPERS_READ_VISIBLE,
    ),
  );
}