Questions every good PHP Developer should be able to answer
I was going through [Questions every good .Net developer should be able to answer][1] and was highly impressed with the content and approach of this question and so in the same spirit, I am asking this question for PHP Developer.


**What questions** do you think should a good **PHP programmer be able to respond?**

**EDIT** : I am marking this question as community wiki as it is not user specific and it aims to serve programming community at large. 

Looking forward for some amazing responses. 

**NOTE** : Please answer questions too as suggested in the comments so that people could learn something new too regarding the language. 


  [1]: http://stackoverflow.com/questions/365489/questions-every-good-net-developer-should-be-able-to-answer
Questions every good PHP Developer should be able to answer
===

I was going through [Questions every good .Net developer should be able to answer][1] and was highly impressed with the content and approach of this question and so in the same spirit, I am asking this question for PHP Developer.


**What questions** do you think should a good **PHP programmer be able to respond?**

**EDIT** : I am marking this question as community wiki as it is not user specific and it aims to serve programming community at large. 

Looking forward for some amazing responses. 

**NOTE** : Please answer questions too as suggested in the comments so that people could learn something new too regarding the language. 


  [1]: http://stackoverflow.com/questions/365489/questions-every-good-net-developer-should-be-able-to-answer