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set_include_path
Sets the include_path configuration option
(PHP 4 >= 4.3.0, PHP 5)
string set_include_path ( string new_include_path )
Sets the include_path configuration option for the duration of the script.
Examples
Example 1859. set_include_path() example
<?php
// Works as of PHP 4.3.0
set_include_path('/inc');
// Works in all PHP versions
ini_set('include_path', '/inc');
?>
Example 1860. 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);
?>