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  • deflate_init()

    版本:php7

    (PHP 7)

    Initialize an incremental deflate context

    说明

    deflate_init(int $encoding[,array $options= array()]): resource

    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

    $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_FIXED or ZLIB_DEFAULT_STRATEGY(the default).

    dictionary

    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

    上篇:deflate_add()

    下篇:gzclose()