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7 file_stream_wrapper_valid_scheme($scheme)

Check that the scheme of a stream URI is valid.

Confirms that there is a registered stream handler for the provided scheme and that it is callable. This is useful if you want to confirm a valid scheme without creating a new instance of the registered handler.


$scheme: A URI scheme, a stream is referenced as "scheme://target".

Return value

Returns TRUE if the string is the name of a validated stream, or FALSE if the scheme does not have a registered handler.

Related topics

13 calls to file_stream_wrapper_valid_scheme()


drupal/includes/, line 222
API for handling file uploads and server file management.


function file_stream_wrapper_valid_scheme($scheme) {
  // Does the scheme have a registered handler that is callable?
  $class = file_stream_wrapper_get_class($scheme);
  if (class_exists($class)) {
    return TRUE;
  else {
    return FALSE;