PHP Debuggin through eclipse

I have a script that starts from root directory(//htdocs) in xampp. The filename of script is y index.php, there is some issue in php file and that is

if(file_exists('includes/dboperations.php')). If I run this script, its ok I will get following error 

Call Stack 
# Time Memory Function Location 
1 0.0045 400376 {main}( ) ..\index.php:0 
2 0.0304 455088 require_once( 'C:\xampp\htdocs\includes\library.inc.php' ) ..\index.php:45 


Deprecated: Assigning the return value of new by reference is deprecated in C:\xampp\php\PEAR\Config.php on line 80 
Call Stack 

What does this error开发者_Python百科 indicates?

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remove the & from C:\xampp\php\PEAR\Config.php on line 80

return value of new by reference is deprecated in php 5.3