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.
