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<gzwriteinflate_get_read_len>
^Zlib FunctionsLast updated: Mon, 26 Oct 2026

inflate_add

(PHP 7, PHP 8)

inflate_add — Incrementally inflate encoded data

Description

function inflate_add(InflateContext $context, string $data, int $flush_mode = ZLIB_SYNC_FLUSH): string|false

Incrementally inflates encoded data in the specified context.

Limitation: header information from GZIP compressed data are not made available.

Parameters

context

A context created with inflate_init().

data

A chunk of compressed data.

flush_mode

One of ZLIB_BLOCK, ZLIB_NO_FLUSH, ZLIB_PARTIAL_FLUSH, ZLIB_SYNC_FLUSH (default), ZLIB_FULL_FLUSH, ZLIB_FINISH. Normally you will want to set ZLIB_NO_FLUSH to maximize compression, and ZLIB_FINISH to terminate with the last chunk of data. See the » zlib manual for a detailed description of these constants.

Return Values

Returns a chunk of uncompressed data, or false on failure.

Errors/Exceptions

If invalid parameters are given, inflating the data requires a preset dictionary, but none is specified, the compressed stream is corrupt or has an invalid checksum, an error of level E_WARNING is generated.

Changelog

Version Description
8.0.0 context expects an InflateContext instance now; previously, a resource was expected.

See Also


<gzwriteinflate_get_read_len>
^Zlib FunctionsLast updated: Mon, 26 Oct 2026