Hi
I want to learn php drupal from the beginning. So can anyone please help me.
thank you.
Same problem like I had 
I currently read http://www.sitepoint.com/store/php-mysql-novice-to-ninja/
Help you how? There are an virtual unlimited supply of articles and document to get started with Drupal but few presented in a sequential manner in order to learn. If you need this, your best turning to a book or two. It takes a long time to become proficient at Drupal, most people try for a while, give up, try again, give up, try again, give up, etc…until one day you realize your a Drupal ninja
https://drupal.org/start
https://drupal.org/documentation/customization/tutorials/beginners-cookbook
If you’re not aware, often times software sites have their own help/documentation/wiki areas where you can learn about how to get started.