## 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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