For someone who's also wondering.
PHP can work even if there is no configuration file(php.ini) loaded,
it will simply applies the default values to directives.
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):
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"
Since PHP 5.1.0, 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. In PHP 5.2.0 and later, 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.
버전 | 설명 |
---|---|
7.0.0 | Hash marks (#) are no longer recognized as comments. |
5.3.0 | Hash marks (#) should no longer be used as comments and will throw a deprecation warning if used. |
5.2.0 | The PHP_INI_SCAN_DIR environment variable can be set to override the scan directory set via the configure script. |
5.1.0 | It is possible to refer to existing .ini variables from within .ini files. |
For someone who's also wondering.
PHP can work even if there is no configuration file(php.ini) loaded,
it will simply applies the default values to directives.
Notice that `error_reporting` CANNOT be interpolated with an environment variable (e.g. `error_reporting = ${PHP_ERROR_REPORTING}`).
`error_reporting` is treated differently than other directives:
if assigned an environment variable, this will be silently ignored and replaced with value `0` (aka no-reporting).
I couldn't find documentation about it.
Is maybe an info that should be added in https://github.com/php/php-src/blob/8f5156fcba9906664ecd97e4c279ee980e522121/php.ini-production#L451-L500 ?
I am not aware if this specific behavior affects only `error_reporting` or also other directive.
For anyone who wants to ignore any directory entirely
On a linux Redhat distro (this was on EL9):
; if using php-fpm, put this file in place"
/etc/systemd/system/php-fpm.service.d/override.conf
[Service]
Environment="PHP_INI_SCAN_DIR="
; do a systemd config reload:
systemctl daemon-reload
; if you want to make sure php on the cli fails if it's not passing 'PHP_INI_SCAN_DIR= php' (this should also affect both linux normal+system users?) then drop this file in place:
cat /etc/php.d/00-dont-use-phpd.ini
auto_prepend_file=MISSING_ENV__PHP_INI_SCAN_DIR__SEE_ETC_PHPD_00_DONT_USE_PHPD_INI
; don't allow php.d directory to load in files
; you must pass 'PHP_INI_SCAN_DIR= ' before your php command on the cli
; reference:
; https://www.php.net/manual/en/configuration.file.php#configuration.file.scan
in php.ini you can reference to an existing directive or an environment variable using the syntax ${varname}.
Here are some examples.
sys_temp_dir = "${WINDIR}"
--- ${WINDIR} will be replaced by $_ENV['WINDIR'] at runtime
--- you can set environment variables by Apache and use them in php.ini
--- FcgidInitialEnv AUTHOR "WUXIANCHENG"
--- error_log = "${AUTHOR}.log"
error_log = "${sys_temp_dir}"
--- ${sys_temp_dir} will be replace by the value of sys_temp_dir
Also you can use PHP constants in php.ini, but DONT'T wrap them in ${} or "".
error_log = "/data/"PHP_VERSION"/"
--- it works like this php code:
$error_log = "/data/" . PHP_VERSION . "/";