This case spend me so much time .
Step 1.
Download this file
FunctionList.zip
Step 2.
Install notepad++ 5.7 and don’t install with %APPDATA%
Step 3.
unzip the FunctionList.zip and copy all file to

This Article is from
http://www.danielkassner.com/2010/01/22/using-notepads-function-list-plugin-for-php-development
http://sourceforge.net/projects/npp-plugins/forums/forum/670934/topic/3568427
(This has been corrected with the V2.1.0.1 version, and also added powershell support:)