inflate_init

(PHP 7, PHP 8)

inflate_initInitialize an incremental inflate context

Description

inflate_init(int $encoding, array $options = []): InflateContext|false

Initialize an incremental inflate context with the specified encoding.

Parameters

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).

Return Values

Returns an inflate context resource (zlib.inflate) on success, or false on failure.

Errors/Exceptions

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

Changelog

Version Description
8.0.0 On success, this function returns an InflateContext instance now; previously, a resource was returned.

Notes

Caution

Unlike gzinflate(), incremental inflate contexts do not constrain the length of the decoded data, so provide no automatic protection against Zip bombs.

See Also

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