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Informations about the package brotli
Brotli Extension for PHP
This extension allows Brotli compression.
Documentation for Brotli can be found at » https://github.com/google/brotli/.
Build
To use the system library (using pkg-config)
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:
Output handler option
| Name | Default | Changeable |
|---|---|---|
| brotli.output_compression | 0 | PHP_INI_ALL |
| brotli.output_compression_level | 11 | PHP_INI_ALL |
| brotli.output_compression_exclude_types | "" | PHP_INI_ALL |
| brotli.output_compression_dict | "" | 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
BROTLI_COMPRESS_LEVEL_DEFAULT(11). -
brotli.output_compression_exclude_types string
The extension contains a built-in list of non-compressible MIME types. The list can be found in the phpinfo() output. If something is missing, more MIME types can be added with this ini setting.
Comma-separated list of MIME types that should not be compressed by the transparent output handler.
Supports exact MIME type matches and wildcard family matches. A wildcard entry must use the
type/*form.Example (both of these are already in the built-in list):
This is useful for already-compressed binary formats where additional Brotli compression usually provides little benefit.
A token prefixed with
!negates a match: it makes the extension compress that MIME type even if it is in the built-in exclusion list. Negation also supports exact matches andtype/*wildcards. Since!is a special character in php.ini, values that use it must be quoted.Within the same list, if a MIME type matches multiple tokens, the last matching token wins, regardless of whether it is positive or negative (the same precedence rule
.gitignoreuses). This allows patterns such as:which excludes all
image/*types exceptimage/png, since the negation is listed after the wildcard.Negation only applies within this setting: if it doesn't produce a definitive match for the current MIME type, the built-in list is still consulted. The built-in list's contents can be seen in the phpinfo() output.
-
brotli.output_compression_dict string
Specifies the path to the compressed dictionary file to be used by the output handler.
can be used when
BROTLI_DICTIONARY_SUPPORTis enabled
Constant
| Name | Description |
|---|---|
| BROTLI_GENERIC | Generic compress mode value |
| BROTLI_TEXT | Text compress mode value |
| BROTLI_FONT | Font compress mode value |
| BROTLI_COMPRESS_LEVEL_MIN | Minimal compress level value |
| BROTLI_COMPRESS_LEVEL_MAX | Maximal compress level value |
| BROTLI_COMPRESS_LEVEL_DEFAULT | Default compress level value |
| BROTLI_PROCESS | Incremental process mode value |
| BROTLI_FLUSH | Incremental produce mode value |
| BROTLI_FINISH | Incremental finalize mode value |
| BROTLI_DICTIONARY_SUPPORT | Dictionary support value |
BROTLI_DICTIONARY_SUPPORTmust be enabled with brotli library version 1.1.0 or higherdictionary only work from compression level 5 or higher note
Function
- brotli_compress — Compress a string
- brotli_uncompress — Uncompress a compressed string
- brotli_compress_init — Initialize an incremental compress context
- brotli_compress_add — Incrementally compress data
- brotli_uncompress_init — Initialize an incremental uncompress context
- brotli_uncompress_add — Incrementally uncompress data
brotli_compress — Compress a string
Description
This function compress a string.
Parameters
-
data
The data to compress.
-
level
The higher the level, 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) orBROTLI_FONT(for WOFF 2.0). -
dict
The dictionary data.
can be used when
BROTLI_DICTIONARY_SUPPORTis enabled
Return Values
The compressed string or FALSE if an error occurred.
brotli_uncompress — Uncompress a compressed string
Description
This function uncompress a compressed string.
Parameters
-
data
The data compressed by brotli_compress().
-
dict
The dictionary data.
can be used when
BROTLI_DICTIONARY_SUPPORTis enabled
Return Values
The original uncompressed data or FALSE on error.
brotli_compress_init — Initialize an incremental compress context
Description
Initialize an incremental compress context.
Parameters
-
level
The higher the level, 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) orBROTLI_FONT(for WOFF 2.0). -
dict
The dictionary data.
can be used when
BROTLI_DICTIONARY_SUPPORTis enabled
Return Values
Returns a Brotli\Compress\Context instance on success,
or FALSE on failure.
brotli_compress_add — Incrementally compress data
Description
Incrementally compress data.
Parameters
-
context
A context created with
brotli_compress_init(). -
data
A chunk of data to compress.
-
mode
One of
BROTLI_FLUSH(default) andBROTLI_PROCESS,BROTLI_FINISH.BROTLI_FINISHto 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
Initialize an incremental uncompress context.
Parameters
-
dict
The dictionary data.
can be used when
BROTLI_DICTIONARY_SUPPORTis enabled
Return Values
Returns a Brotli\UnCompress\Context instance on success,
or FALSE on failure.
brotli_uncompress_add — Incrementally uncompress data
Description
Incrementally uncompress data.
Parameters
-
context
A context created with
brotli_uncompress_init(). -
data
A chunk of compressed data.
-
mode
One of
BROTLI_FLUSH(default) andBROTLI_PROCESS,BROTLI_FINISH.BROTLI_FINISHto terminate with the last chunk of data.
Return Values
Returns a chunk of uncompressed data, or FALSE on failure.
Namespace
alias functions..
Streams
Brotli compression and uncompression are available using the
compress.brotli:// stream prefix.
Examples
Output handler
"Accept-Encoding: br" must be specified.
Namespace
Streams
Incrementally
Dictionary
Experimental: Compression Dictionary Transport support
must be specified headers.
Accept-Encoding: dcbAvailable-Dictionary: :<base64-hash>:
