PHP Manual
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(PHP 4 >= 4.3.0, PHP 5)
Sets the include_path configuration option for the duration of the script. Returns the old include_path on success or FALSE on failure.
Example 1. set_include_path() example
<?php// Works as of PHP 4.3.0set_include_path('/inc');// Works in all PHP versionsini_set('include_path', '/inc');?>
Example 2. Adding to the include path
Making use of the PATH_SEPARATOR constant, it is possible to extend the include path regardless of the operating system.
In this example we add /usr/lib/pear to the end of the existing include_path.
<?php$path = '/usr/lib/pear';set_include_path(get_include_path() . PATH_SEPARATOR . $path);?>
See also ini_set(), get_include_path(), restore_include_path(), and include().