The configuration fileThe configuration file (php.ini) is read when PHP starts up. For the server module versions of PHP, this happens only once when the web server is started. For the CGI and CLI versions, it happens on every invocation. php.ini is searched for in these locations (in order):
If php-SAPI.ini exists (where SAPI is the SAPI in use, so, for example, php-cli.ini or php-apache.ini), it is used instead of php.ini. The SAPI name can be determined with php_sapi_name.
Using environment variables can be used in php.ini as shown below.
Example #1 php.ini Environment Variables ; PHP_MEMORY_LIMIT is taken from environment memory_limit = ${PHP_MEMORY_LIMIT} The php.ini directives handled by extensions are documented on the respective pages of the extensions themselves. A list of the core directives is available in the appendix. Not all PHP directives are necessarily documented in this manual: for a complete list of directives available in your PHP version, please read your well commented php.ini file. Alternatively, you may find » the latest php.ini from Git helpful too.
Example #2 php.ini example ; any text on a line after an unquoted semicolon (;) is ignored [php] ; section markers (text within square brackets) are also ignored ; Boolean values can be set to either: ; true, on, yes ; or false, off, no, none register_globals = off track_errors = yes ; you can enclose strings in double-quotes include_path = ".:/usr/local/lib/php" ; backslashes are treated the same as any other character include_path = ".;c:\php\lib"
It is possible to refer to existing .ini variables from
within .ini files. Example: Scan directoriesIt is possible to configure PHP to scan for .ini files in a directory after reading php.ini. This can be done at compile time by setting the --with-config-file-scan-dir option. The scan directory can then be overridden at run time by setting the PHP_INI_SCAN_DIR environment variable.
It is possible to scan multiple directories by separating them with the
platform-specific path separator (
Within each directory, PHP will scan all files ending in
Assuming PHP is configured with --with-config-file-scan-dir=/etc/php.d, and that the path separator is :... $ php PHP will load all files in /etc/php.d/*.ini as configuration files. $ PHP_INI_SCAN_DIR=/usr/local/etc/php.d php PHP will load all files in /usr/local/etc/php.d/*.ini as configuration files. $ PHP_INI_SCAN_DIR=:/usr/local/etc/php.d php PHP will load all files in /etc/php.d/*.ini, then /usr/local/etc/php.d/*.ini as configuration files. $ PHP_INI_SCAN_DIR=/usr/local/etc/php.d: php PHP will load all files in /usr/local/etc/php.d/*.ini, then /etc/php.d/*.ini as configuration files. |