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.
For further details and definitions of the
INI_* modes, see the
Where a configuration setting may be set.
Here's a short explanation of
the configuration directives.
-
zlib.output_compression
bool/int
-
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
int
-
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.