预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

FORCE_GZIP (int)

FORCE_DEFLATE (int)

ZLIB_ENCODING_RAW (int)

DEFLATE 压缩算法，按照 RFC 1951 标准。

ZLIB_ENCODING_DEFLATE (int)

ZLIB 压缩算法，按照 RFC 1950 标准。

ZLIB_ENCODING_GZIP (int)

GZIP algorithm as per RFC 1952.

ZLIB_FILTERED (int)

ZLIB_HUFFMAN_ONLY (int)

ZLIB_FIXED (int)

ZLIB_RLE (int)

ZLIB_DEFAULT_STRATEGY (int)

ZLIB_BLOCK (int)

ZLIB_NO_FLUSH (int)

ZLIB_PARTIAL_FLUSH (int)

ZLIB_SYNC_FLUSH (int)

ZLIB_FULL_FLUSH (int)

ZLIB_FINISH (int)