The 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):
PHPIniDir directive
in Apache 2, -c command line option in CGI and CLI)
php.ini file
can be set for different versions of PHP. The root of the registry keys depends on 32- or 64-bitness of the installed OS and PHP.
For 32-bit PHP on a 32-bit OS or a 64-bit PHP on a 64-bit OS use [(HKEY_LOCAL_MACHINE\SOFTWARE\PHP] for 32-bit version of PHP on a 64-bit OS use [HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\PHP]] instead.
For same bitness installation the following registry keys
are examined in order:
[HKEY_LOCAL_MACHINE\SOFTWARE\PHP\x.y.z],
[HKEY_LOCAL_MACHINE\SOFTWARE\PHP\x.y] and
[HKEY_LOCAL_MACHINE\SOFTWARE\PHP\x], where
x, y and z mean the PHP major, minor and release versions.
For 32 bit versions of PHP on a 64 bit OS the following registry keys are examined in order:
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6421Node\PHP\x.y.z],
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6421Node\PHP\x.y] and
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6421Node\PHP\x], where
x, y and z mean the PHP major, minor and release versions.
If there is a
value for IniFilePath in any of these keys, the first
one found will be used as the location of the php.ini
(Windows only).
[HKEY_LOCAL_MACHINE\SOFTWARE\PHP] or
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\PHP], value of
IniFilePath (Windows only).
--with-config-file-path compile time option.
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().
Note:
The Apache web server changes the directory to root at startup, causing PHP to attempt to read php.ini from the root filesystem if it exists.
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: open_basedir = ${open_basedir}
":/new/dir".
It 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 (; on Windows, NetWare
and RISC OS; : on all other platforms; the value PHP is
using is available as the PATH_SEPARATOR constant).
If a blank directory is given in PHP_INI_SCAN_DIR, PHP
will also scan the directory given at compile time via
--with-config-file-scan-dir.
Within each directory, PHP will scan all files ending in
.ini in alphabetical order. A list of the files that
were loaded, and in what order, is available by calling
php_ini_scanned_files(), or by running PHP with the
--ini option.
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.