Error while debugging Magento Standard.php - php

Question

I am trying to debug Magendo 1.9.2.4 app\code\core\Mage\Core\Controller\Varien\Router\Standard.php. I am using PhpStorm with Xdebug.
During the debug it shows me an error that it cannot find the class Abstract that it's referring to.
Here is the full log:
C:\xampp\php\php.exe -dxdebug.remote_enable=1 -dxdebug.remote_mode=req -dxdebug.remote_port=9000 -dxdebug.remote_host=127.0.0.1 C:\xampp\htdocs\vaimo\app\code\core\Mage\Core\Controller\Varien\Router\Standard.php
PHP Fatal error: Class 'Mage_Core_Controller_Varien_Router_Abstract' not found in C:\xampp\htdocs\vaimo\app\code\core\Mage\Core\Controller\Varien\Router\Standard.php on line 28
PHP Stack trace:
PHP 1. {main}() C:\xampp\htdocs\vaimo\app\code\core\Mage\Core\Controller\Varien\Router\Standard.php:0
Fatal error: Class 'Mage_Core_Controller_Varien_Router_Abstract' not found in C:\xampp\htdocs\vaimo\app\code\core\Mage\Core\Controller\Varien\Router\Standard.php on line 28
Call Stack:
0.0699 193008 1. {main}() C:\xampp\htdocs\vaimo\app\code\core\Mage\Core\Controller\Varien\Router\Standard.php:0
Process finished with exit code 255
Class Standard extends from Abstract class which is located in different file but in the same folder with Standard.

Answer 1

You are doing it wrong.
You are debugging your code in CLI environment ("PHP Script" type of Run/Debug Configuration). This way you are executing your C:\xampp\htdocs\vaimo\app\code\core\Mage\Core\Controller\Varien\Router\Standard.php file directly in terminal hence the Magento's bootstrap code (class autoloading etc) is not executed and PHP (yes, this error comes from PHP interpreter itself) is unable to find your parent class.
Solution: do not debug in CLI mode using "PHP Script" type of config -- debug it via browser as Web Application instead with correct type of config. This way normal Magento routine will be in place (autoloading/configs/db connection/etc) -- https://confluence.jetbrains.com/display/PhpStorm/Debugging+PHP+Web+Applications+with+Run+Debug+Configurations.
All debugging materials
Zero-configuration approach -- when you initiate debugging from the browser using xdebug browser extension or manually setting up cookie/xdebug param.