Recipe 8.24 Setting Configuration Variables
8.24.1 Problem
You want to change the
value of a PHP configuration setting.
8.24.2 Solution
Use ini_set( ):
// add a directory to the include path
ini_set('include_path', ini_get('include_path') . ':/home/fezzik/php');
8.24.3 Discussion
Configuration variables are not permanently changed by
ini_set( ). The new value lasts only for the
duration of the request in which ini_set( ) is
called. To make a persistent modification, alter the values stored in
the php.ini file.
It isn't meaningful to alter certain variables, such
as asp_tags
or
register_globals because by the time you call
ini_set( ) to modify the setting,
it's too late to change the behavior the setting
affects. If a variable can't be changed,
ini_set( ) returns false.
However, it is useful to alter
configuration variables in certain pages. For example, if
you're running a script from the command line, set
html_errors to
off.
To reset a variable back to its original setting, use
ini_restore( ):
ini_restore('sendmail_from'); // go back to the default value
8.24.4 See Also
Recipe 8.23 on getting values of
configuration variables; documentation on ini_set(
) at http://www.php.net/ini-set and
ini_restore( ) at http://www.php.net/ini-restore.
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