Debugging Tips:
1. In your .htaccess, add
SetEnv MAGE_IS_DEVELOPER_MODE
2. Under system -> configuration -> advanced -> developer,
change current configuration scope dropdown on top left to main website, then debug -> turn template hints and block name hints to on.
3. We can log errors easily.
Mage::log($var);
4. To display popup errors,
Mage::throwException(“Your debug message here”);
5. To see a list of all events (useful when create events/observers in config.xml)
cd /app/code/core/Mage grep -r -i Mage::dispatchEvent *
