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
1 month 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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