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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 PHP_INI_PERDIR therefore it may not be set using ini_set(). However, the display_errors directive is PHP_INI_ALL therefore it may be set anywhere, including with ini_set().

Definition of PHP_INI_* modes
Mode Value Meaning
PHP_INI_USER 1 Entry can be set in user scripts (like with ini_set()) or in the Windows registry
PHP_INI_PERDIR 6 Entry can be set in php.ini, .htaccess or httpd.conf
PHP_INI_SYSTEM 4 Entry can be set in php.ini or httpd.conf
PHP_INI_ALL 7 Entry can be set anywhere

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User Contributed Notes 1 note

mritunjay dot kumar at ballisticlearning dot com
1 year ago
There are several Apache directives that allow you to change the PHP configuration from within the Apache configuration files. For a listing of which directives are PHP_INI_ALL, PHP_INI_PERDIR, or PHP_INI_SYSTEM.

Sets the value of the specified directive. Can be used only with PHP_INI_ALL and PHP_INI_PERDIR type directives. To clear a previously set value use none as the value.

A handy trick to pick up parse errors in test_file.php if you can't set display_errors in php.ini or use .htaccess:
ini_set ('display_errors', true);
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