public LocalStream::stream_cast($cast_as)
Retrieve the underlying stream resource.
This method is called in response to stream_select().
int $cast_as: Can be STREAM_CAST_FOR_SELECT when stream_select() is calling stream_cast() or STREAM_CAST_AS_STREAM when stream_cast() is called for other uses.
resource|false The underlying stream resource or FALSE if stream_select() is not supported.
Overrides PhpStreamWrapperInterface::stream_cast
http://php.net/manual/streamwrapper.stream-cast.php
public function stream_cast($cast_as) { return $this->handle ? $this->handle : FALSE; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!StreamWrapper!LocalStream.php/function/LocalStream::stream_cast/8.1.x