这些函数的行为受 php.ini 的影响。
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.
| 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. |
有关 PHP_INI_* 常量进一步的细节与定义参见php.ini 配置选项。
以下是配置选项的简要解释。
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.
Compression level used for transparent output compression.
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.