PHP Manual
Zlib-Funktionen
Initialize an incremental deflate context

deflate_init

(PHP 7, PHP 8)

deflate_init — Initialize an incremental deflate context

Beschreibung

deflate_init(int $encoding, array $options = []): DeflateContext|false

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.)

Parameter-Liste

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. zlib changes a window size of 8 to 9, and as of zlib 1.2.8 fails with a warning, if a window size of 8 is requested for ZLIB_ENCODING_RAW or ZLIB_ENCODING_GZIP.
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).