note 102778 rejected from function.include-once by danbrown

Note Submitter: vknrvk at yahoo dot com 

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I am trying to use PHP 5.3.5 for development of a system. When I try the commands

include PEAR_DIR.'Compat.php' 
PHP_Compat::loadFunction('file_get_contents');

it is returning error Class 'PHP_Compat' not found

I can load the file in the browser with correct directory path. I tried the command

include_once dirname(__FILE__).'/libs/Pear/Compat.php';

This also showing same error.

This is a general pattern happening with include, include_once, require and require_once commands.

Any helping pointers are really appreciated.