Stream Wrapper¶
A wrapper is additional code which tells the stream how to handle specific protocols/encodings.
PHP supports several wrappers natively, in particular file://, http://, ftp://, php://, zlib://, data://, glob://, phar://, ssh2://, rar://, ogg:// and expect://.
Customs wrappers may be registered with stream_wrapper_register(). A wrapper may write in any kind of format.
See also A Guide to Streams in PHP: In-Depth Tutorial With Examples, Supported Protocols and Wrappers, stream_wrapper_register, Example class registered as stream wrapper