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php-manual-en-4.3.0-2mdk.noarch.rpm

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><A
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>Chapter 43. Streams API for PHP Extension Authors</A
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>Table of Contents</B
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><A
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>Overview</A
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>Streams Basics</A
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>Streams as Resources</A
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>Streams Common API Reference</A
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>Streams Dir API Reference</A
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>Streams File API Reference</A
></DT
><DT
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>Streams Socket API Reference</A
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>Streams Structures</A
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>Overview</H1
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>&#13;   The PHP Streams API introduces a unified approach to the handling of
   files and sockets in PHP extension.  Using a single API with standard
   functions for common operations, the streams API allows your extension
   to access files, sockets, URLs, memory and script-defined objects.
   Streams is a run-time extensible API that allows dynamically loaded
   modules (and scripts!) to register new streams.
  </P
><P
>&#13;   The aim of the Streams API is to make it comfortable for developers to
   open files, urls and other streamable data sources with a unified API
   that is easy to understand.  The API is more or less based on the ANSI
   C stdio family of functions (with identical semantics for most of the main
   functions), so C programmers will have a feeling of familiarity with streams.
  </P
><P
>&#13;    The streams API operates on a couple of different levels: at the base level,
    the API defines php_stream objects to represent streamable data sources.
    On a slightly higher level, the API defines php_stream_wrapper objects
    which "wrap" around the lower level API to provide support for retrieving
    data and meta-data from URLs.
  </P
><P
>&#13;   Streams can be cast (converted) into other types of file-handles, so that they
   can be used with third-party libraries without a great deal of trouble.  This
   allows those libraries to access data directly from URL sources.  If your
   system has the <B
CLASS="function"
>fopencookie()</B
> or
   <B
CLASS="function"
>funopen()</B
> function, you can even
   pass any PHP stream to any library that uses ANSI stdio!
  </P
><P
>&#13;   <DIV
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><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
     The functions in this chapter are for use in the PHP source code and
     are not PHP functions.  Userland stream functions can be found in the 
     <A
HREF="ref.stream.html"
>Stream Reference</A
>.
    </P
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