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。
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FORCE_GZIP(integer) -
FORCE_DEFLATE(integer) -
ZLIB_ENCODING_RAW(integer) - DEFLATE algorithm as per RFC 1951. Available as of PHP 7.0.0.
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ZLIB_ENCODING_DEFLATE(integer) - ZLIB compression algorithm as per RFC 1950. Available as of PHP 7.0.0.
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ZLIB_ENCODING_GZIP(integer) - GZIP algorithm as per RFC 1952. Available as of PHP 7.0.0.
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ZLIB_FILTERED(integer) - Available as of PHP 7.0.0.
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ZLIB_HUFFMAN_ONLY(integer) - Available as of PHP 7.0.0.
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ZLIB_FIXED(integer) - Available as of PHP 7.0.0.
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ZLIB_RLE(integer) - Available as of PHP 7.0.0.
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ZLIB_DEFAULT_STRATEGY(integer) - Available as of PHP 7.0.0.
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ZLIB_BLOCK(integer) - Available as of PHP 7.0.0.
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ZLIB_NO_FLUSH(integer) - Available as of PHP 7.0.0.
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ZLIB_PARTIAL_FLUSH(integer) - Available as of PHP 7.0.0.
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ZLIB_SYNC_FLUSH(integer) - Available as of PHP 7.0.0.
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ZLIB_FULL_FLUSH(integer) - Available as of PHP 7.0.0.
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ZLIB_FINISH(integer) - Available as of PHP 7.0.0.