Brotli Extension for PHP

This extension allows Brotli compression.

Documentation for Brotli can be found at » https://github.com/google/brotli/.

Build

% git clone --recursive --depth=1 https://github.com/kjdev/php-ext-brotli.git
% cd php-ext-brotli
% phpize
% ./configure
% make
$ make install

To use the system library (using pkg-config)

% ./configure --with-libbrotli

Distribution binary packages

Fedora / CentOS / RHEL

RPM packages of this extension are available in » Remi's RPM repository and are named php-brotli.

Configuration

php.ini:

extension=brotli.so

Output handler option

Name	Default	Changeable
brotli.output_compression	0	PHP_INI_ALL
brotli.output_compression_level	-1	PHP_INI_ALL

• brotli.output_compression boolean

  Whether to transparently compress pages. If this option is set to "On" in php.ini or the Apache configuration, pages are compressed if the browser sends an "Accept-Encoding: br" header. "Content-Encoding: br" and "Vary: Accept-Encoding" headers are added to the output. In runtime, it can be set only before sending any output.

• brotli.output_compression_level integer

  Compression level used for transparent output compression. Specify a value between 0 to 11. The default value of -1 uses internally defined values (11).

Available since PHP 5.4.0.

Constant

Name	Description
BROTLI_COMPRESS_LEVEL_MIN	Minimal compress level value
BROTLI_COMPRESS_LEVEL_MAX	Maximal compress level value
BROTLI_COMPRESS_LEVEL_DEFAULT	Default compress level value

Function

• brotli_compress — Compress a string
• brotli_uncompress — Uncompress a compressed string
• brotli_compress_init — Initialize an incremental compress context (PHP 7)
• brotli_compress_add — Incrementally compress data (PHP 7)
• brotli_uncompress_init — Initialize an incremental uncompress context (PHP 7)
• brotli_uncompress_add — Incrementally uncompress data (PHP 7)

---

brotli_compress — Compress a string

Description

string brotli_compress ( string $data [, int $quality = BROTLI_COMPRESS_LEVEL_DEFAULT, int $mode = BROTLI_GENERIC ] )

This function compress a string.

Parameters

• data

  The data to compress.

• quality

  The higher the quality, the slower the compression. (Defaults to BROTLI\_COMPRESS\_LEVEL\_DEFAULT)

• mode

  The compression mode can be BROTLI_GENERIC (default), BROTLI_TEXT (for UTF-8 format text input) or BROTLI_FONT (for WOFF 2.0).

Return Values

The compressed string or FALSE if an error occurred.

---

brotli_uncompress — Uncompress a compressed string

Description

string brotli_uncompress ( string $data [, int $length = 0 ] )

This function uncompress a compressed string.

Parameters

• data

  The data compressed by brotli_compress().

• length

  The maximum length of data to decode.

Return Values

The original uncompressed data or FALSE on error.

---

brotli_compress_init — Initialize an incremental compress context

Description

resource brotli_compress_init ( [ int $quality = BROTLI_COMPRESS_LEVEL_DEFAULT, int $mode = BROTLI_GENERIC ] )

Initialize an incremental compress context. (PHP 7)

Parameters

• quality

  The higher the quality, the slower the compression. (Defaults to BROTLI\_COMPRESS\_LEVEL\_DEFAULT)

• mode

  The compression mode can be BROTLI_GENERIC (default), BROTLI_TEXT (for UTF-8 format text input) or BROTLI_FONT (for WOFF 2.0).

Return Values

Returns a brotli context resource (brotli.state) on success, or FALSE on failure.

---

brotli_compress_add — Incrementally compress data

Description

string brotli_compress_add ( resource $context, string $data [, $mode = BROTLI_PROCESS ] )

Incrementally compress data. (PHP 7)

Parameters

• context

  A context created with brotli_compress_init().

• data

  A chunk of data to compress.

• mode

  One of BROTLI_PROCESS (default), BROTLI_FINISH.

  BROTLI_FINISH to terminate with the last chunk of data.

Return Values

Returns a chunk of compressed data, or FALSE on failure.

---

brotli_uncompress_init — Initialize an incremental uncompress context

Description

resource brotli_uncompress_init ( void )

Initialize an incremental uncompress context. (PHP 7)

Return Values

Returns a brotli context resource (brotli.state) on success, or FALSE on failure.

---

brotli_uncompress_add — Incrementally uncompress data

Description

string brotli_uncompress_add ( resource $context, string $data [, $mode = BROTLI_PROCESS ] )

Incrementally uncompress data. (PHP 7)

Parameters

• context

  A context created with brotli_uncompress_init().

• data

  A chunk of compressed data.

• mode

  One of BROTLI_PROCESS (default), BROTLI_FINISH.

  BROTLI_FINISH to terminate with the last chunk of data.

Return Values

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

Namespace

Namespace Brotli;

function compress( $data [, $quality = \\BROTLI\_COMPRESS\_LEVEL\_DEFAULT, $mode = \\BROTLI\_GENERIC ] )
function uncompress( $data [, $length = 0 ] )
function compress\_init( [ $quality = \\BROTLI\_COMPRESS\_LEVEL\_DEFAULT, $mode = \\BROTLI\_GENERIC ] )
function compress\_add( resource $context, string $data [, $mode = \\BROTLI\_PROCESS] )
function uncompress\_init()
function uncompress\_add( resource $context, string $data [, $mode = \\BROTLI\_PROCESS] )

alias functions..

Streams

Brotli compression and uncompression are available using the compress.brotli:// stream prefix.

Examples

$compressed = brotli_compress('Compresstest');

$uncompressed = brotli_uncompress($compressed);

echo $uncompressed;

Output handler

ini_set('brotli.output_compression', 'On');
// OR
// ob_start('ob_brotli_handler');

echo ...;

"Accept-Encoding: br" must be specified.

Namespace

$data = \Brotli\compress('test');

\Brotli\uncompress($data);

Streams

file_put_contents("compress.brotli:///patch/to/data.br", $data);
readfile("compress.brotli:///patch/to/data.br");

Incrementally

// compression
$resource = brotli_compress_init();
$compressed = '';
$compressed .= brotli_compress_add($resource, 'Hello, ', BROTLI_PROCESS);
$compressed .= brotli_compress_add($resource, 'World!', BROTLI_PROCESS);
$compressed .= brotli_compress_add($resource, '', BROTLI_FINISH);

echo brotli_uncompress($compressed), PHP_EOL; // Hello, World!

// uncompression
$resource = brotli_uncompress_init();
$uncompressed = '';
$uncompressed .= brotli_uncompress_add($resource, substr($compressed, 0, 5), BROTLI_PROCESS);
$uncompressed .= brotli_uncompress_add($resource, substr($compressed, 5), BROTLI_PROCESS);
$uncompressed .= brotli_uncompress_add($resource, '', BROTLI_FINISH);

echo $uncompressed, PHP_EOL; // Hello, World!