Where a configuration setting may be set

These modes determine when and where a PHP directive may or may not be set, and each directive within the manual refers to one of these modes. For example, some settings may be set within a PHP script using ini_set() , whereas others may require php.ini or httpd.conf.

For example, the output_buffering setting is INI_PERDIR therefore it may not be set using ini_set() . However, the display_errors directive is INI_ALL therefore it may be set anywhere, including with ini_set() .

INI mode constants

INI_USER (int )

Entry can be set in user scripts (like with ini_set() ) or in the Windows registry. Entry can be set in .user.ini

INI_PERDIR (int )

Entry can be set in php.ini, .htaccess, httpd.conf or .user.ini

INI_SYSTEM (int )

Entry can be set in php.ini or httpd.conf

INI_ALL (int )

Entry can be set anywhere

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