Programming Language most relevant to the Financial sector? [closed]

Question

I am a freshman in college and doing a software engineering/ finance double major. I've been learning programming on my own and have a good bit of familiarity with php by now. I was wondering what you guys think the most relevant programming language is for financial/investment banking use?

I have read this thread: https://softwareengineering.stackexchange.com/questions/13109/books-on-developing-software-for-financial-markets-investment-banks

I want to start learning/reading up on a language (the basics not financial/quant stuff) to set a foundation for the future financial/quant stuff.