Should I mention PSR Coding Standard (PSR-1, PSR-2) in resume? It will be good for a programmer or not? Please guide me
Unless you're hurting for resume material I wouldn't. Lots of places use PSR 1 & 2 for the coding style guidelines, but lots of places don't.
The interview would be a good place to bring it up. Ask them if they have in-house style guidelines or if they adhere to the PSRs. People always seem to need more questions to ask, that's a good one. If they use PSRs then it's easy, you already know and follow them. If they use in-house then great, you understand style guidelines and can adapt to whatever they need.
Of course it will depend on the company etc., but be aware that it could be a negative sign.
PHP has many users just trying to make their own site, without any programming experience. This group is the most important audience for the 12 PSR documents, topicwise (altough no one reads it)
When hiring a professional programmer, hearing that he/she knows PSR and does not know/fulfil one of the topics in any way (but "boast" with others in the resume), is not a good sign.