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## Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

The zlib extension offers the option to transparently compress your pages on-the-fly, if the requesting browser supports this. Therefore there are three options in the configuration file php.ini.

Zlib Configuration Options
Name | Default | Changeable | Changelog
--- | --- | --- | ---
zlib.output_compression | "0" | PHP_INI_ALL | Available since PHP 4.0.5.
zlib.output_compression_level | "-1" | PHP_INI_ALL | Available since PHP 4.3.0.
zlib.output_handler | "" | PHP_INI_ALL | Available since PHP 4.3.0.

For further details and definitions of the PHP_INI_* modes, see the Where a configuration setting may be set.

Here's a short explanation of the configuration directives.

`zlib.output_compression` boolean/integer

  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: gzip" or "deflate" header. "Content-Encoding: gzip" (respectively "deflate") and "Vary: Accept-Encoding" headers are added to the output. In runtime, it can be set only before sending any output.

  This option also accepts integer values instead of boolean "On"/"Off", using this you can set the output buffer size (default is 4KB).

  > Note:

  > output_handler must be empty if this is set 'On' ! Instead you must use zlib.output_handler.

`zlib.output_compression_level` integer

  Compression level used for transparent output compression. Specify a value between 0 (no compression) to 9 (most compression). The default value, -1, lets the server decide which level to use.

`zlib.output_handler` string

  You cannot specify additional output handlers if zlib.output_compression is activated here. This setting does the same as output_handler but in a different order.

Installation
Resource Types
Installing/Configuring
PHP Manual