deflate_init
(PHP 7)
deflate_init — Initialize an incremental deflate context
説明
$encoding
[, array $options = array()
] )
Initializes an incremental deflate context using the specified
encoding.
Note that the window option here only sets the window size
of the algorithm, differently from the zlib filters where the same parameter
also sets the encoding to use; the encoding must be set with the
encoding parameter.
Limitation: there is currently no way to set the header information on a GZIP compressed stream, which are set as follows: GZIP signature (\x1f\x8B); compression method (\x08 == DEFLATE); 6 zero bytes; the operating system set to the current system (\x00 = Windows, \x03 = Unix, etc.)
パラメータ
-
encoding -
One of the
ZLIB_ENCODING_*constants. -
options -
An associative array which may contain the following elements:
- level
-
The compression level in range -1..9; defaults to -1.
- memory
-
The compression memory level in range 1..9; defaults to 8.
- window
-
The zlib window size (logarithmic) in range 8..15; defaults to 15.
- strategy
-
One of
ZLIB_FILTERED,ZLIB_HUFFMAN_ONLY,ZLIB_RLE,ZLIB_FIXEDorZLIB_DEFAULT_STRATEGY(the default). - dictionary
-
A string or an array of strings of the preset dictionary (default: no preset dictionary).
返り値
Returns a deflate context resource (zlib.deflate) on
success, 失敗した場合に FALSE を返します.
エラー / 例外
If an invalid option is passed to options or the
context couldn't be created, an error of level E_WARNING
is generated.
参考
- deflate_add() - Incrementally deflate data
- inflate_init() - Initialize an incremental inflate context
忘却曲線を使ってこの関数を確実に記憶に残す
