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# Compression Streams

`zlib:` PHP 4.0.4 - PHP 4.2.3 (systems with fopencookie only)

`compress.zlib://` and `compress.bzip2://` PHP 4.3.0 and up

- `zlib:`

- `compress.zlib://`

- `compress.bzip2://`

`zlib:` works like gzopen(), except that the stream can be used with fread() and the other filesystem functions. This is deprecated as of PHP 4.3.0 due to ambiguities with filenames containing ':' characters; use `compress.zlib://` instead.

`compress.zlib://` and `compress.bzip2://` are equivalent to gzopen() and bzopen() respectively, and operate even on systems that do not support fopencookie.

表格 L-7. Wrapper Summary

Attribute | Supported
--- | ---
Restricted by allow_url_fopen. | No
Allows Reading | Yes
Allows Writing | Yes
Allows Appending | Yes
Allows Simultaneous Reading and Writing | No
Supports stat() | No, use the normal file:// wrapper to stat compressed files.
Supports unlink() | No, use the normal file:// wrapper to unlink compressed files.
Supports rename() | No
Supports mkdir() | No
Supports rmdir() | No

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