deflate_init()

版本：php7

(PHP 7)

Initialize an incremental deflate context

说明

Initializes an incremental deflate context using the specified$encoding.

Note that thewindowoption 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$encodingparameter.

Limitation: there is currently no way to set the header information on a GZIP compressed stream, which are set as follows: GZIP signature(x1fx8B); compression method(x08== DEFLATE); 6 zero bytes; the operating system set to the current system(x00= Windows,x03= Unix, etc.)

参数

One of the ZLIB_ENCODING_* constants.

An associative array which may contain the following elements:

The compression level in range -1..9; defaults to -1.

The compression memory level in range 1..9; defaults to 8.

The zlib window size(logarithmic)in range 8..15; defaults to 15.

One of ZLIB_FILTERED,ZLIB_HUFFMAN_ONLY,ZLIB_RLE,ZLIB_FIXED or ZLIB_DEFAULT_STRATEGY(the default).

A string or an array of strings of the preset dictionary(default: no preset dictionary).

返回值

Returns a deflate context resource(zlib.deflate)on success,或者在失败时返回FALSE.

错误／异常

If an invalid option is passed to$optionsor the context couldn't be created, an error of level E_WARNING is generated.

参见

• deflate_add()Incrementally deflate data
• inflate_init()Initialize an incremental inflate context

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