htaccess files
??? PHP_INI_SYSTEM: Directive can be modified within the php.ini and httpd.conf files
??? PHP_INI_USER: Directive can be modified within user scripts
??? PHP_INI_ALL: Directive can be modified anywhere
PHP??™s Configuration Directives
The following sections introduce many of PHP??™s core configuration directives. In
addition to a general definition, each section includes the configuration directive??™s
scope and default value. Because you??™ll probably spend the majority of your time
working with these variables from within the php.ini file, the directives are introduced
as they appear in this file.
Note that the directives introduced in this section are largely relevant solely to
PHP??™s general behavior; directives pertinent to extensions, or to topics in which
considerable attention is given later in the book, are not introduced in this section
but rather are introduced in the appropriate chapter.
Language Options
The directives located in this section determine some of the language??™s most basic
behavior. You??™ll definitely want to take a few moments to become acquainted with
these configuration possibilities.
engine = On | Off
Scope: PHP_INI_ALL; Default value: On
This parameter is responsible for determining whether the PHP engine is available.
Turning it off prevents you from using PHP at all. Obviously, you should leave this
enabled if you plan to use PHP.
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