What do you mean by Get_include_path ()? What to do with it

What do you mean by Get_include_path ()?
This code Set_include_path (include_path. Path_separator. Get_include_path ());

I said Baidu can be limited to include and require path range
But I echo Get_include_path (); The output is f:\appserv\www\iwb/application/;.; C:\php5\pear
the back of;; What kind of C:\php5\pear?

------Solution--------------------
Paer is a library of PHP, which provides a lot of ready-to-package objects, like JavaScript's jquery. When you want to use this library, you can put the library files in the C:\php5\pear, not in the site directory.
------Solution--------------------
The Get_include_path function returns the current PHP search path (usually the include_path in php.ini)

When no additional include_path is set, PHP defaults to include_path.; C:\php5\pear (in Window System)

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