How to define the library path in Zend framework?

Zend framework - Interview Questions

First create directory 'library', and put 'Zend' directory in it. Now you should add library to your include path. Edit index.php file :

$includePath = array();  
$includePath[] = '.';  
$includePath[] = './../application';  
$includePath[] = './../library';  
$includePath[] = get_include_path();  
$includePath = implode(PATH_SEPARATOR,$includePath);  
set_include_path($includePath);