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Setting Configuration Variables in PHP
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Setting Configuration Variables in PHP

InfinityCoder December 23, 2016

You want to change the value of a PHP configuration setting.

Use ini_set():

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// add a directory to the include path
ini_set('include_path', ini_get('include_path') . ':/home/fezzik/php');

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, 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():

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ini_restore('sendmail_from'); // go back to the default value

 

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