PHP 7, PHP 8
inflate_add - Incrementally inflate encoded data

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.



A context created with inflate_init.


A chunk of compressed data.


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.

Exceptions and Errors

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.


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

Related Functions

Function inflate_add:

  • Manual

Zlib Compression Functions

Most used PHP functions