PHP 7.2.0 Release Candidate 4 Released

Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

FORCE_GZIP (integer)
FORCE_DEFLATE (integer)
ZLIB_ENCODING_RAW (integer)
DEFLATE algorithm as per RFC 1951. Available as of PHP 7.0.0.
ZLIB_ENCODING_DEFLATE (integer)
ZLIB compression algorithm as per RFC 1950. Available as of PHP 7.0.0.
ZLIB_ENCODING_GZIP (integer)
GZIP algorithm as per RFC 1952. Available as of PHP 7.0.0.
ZLIB_FILTERED (integer)
Available as of PHP 7.0.0.
ZLIB_HUFFMAN_ONLY (integer)
Available as of PHP 7.0.0.
ZLIB_FIXED (integer)
Available as of PHP 7.0.0.
ZLIB_RLE (integer)
Available as of PHP 7.0.0.
ZLIB_DEFAULT_STRATEGY (integer)
Available as of PHP 7.0.0.
ZLIB_BLOCK (integer)
Available as of PHP 7.0.0.
ZLIB_NO_FLUSH (integer)
Available as of PHP 7.0.0.
ZLIB_PARTIAL_FLUSH (integer)
Available as of PHP 7.0.0.
ZLIB_SYNC_FLUSH (integer)
Available as of PHP 7.0.0.
ZLIB_FULL_FLUSH (integer)
Available as of PHP 7.0.0.
ZLIB_FINISH (integer)
Available as of PHP 7.0.0.
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dave dot mariano1991 at gmail dot com
20 days ago
I'm noticing that all the ZLIB_ENCODING_* constants are documented to exist as of PHP 7.0, but I seem to be able to use them in PHP 5.5.9.

Could someone please confirm this documentation?
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