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.