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: 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.
Table I-6. Wrapper Summary
|Restricted by allow_url_fopen.||No|
|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.|