This will greatly depend on your needs. If you are interested in developing for WEB, PHP is a fairly easy language to learn.
If you follow with PHP, I highly recommend you study some framework:
Codeigniter: High learning curve, MVC quite simple and so is quite versatile. With good knowledge you can modify it to suit you better. Recommended for websites.
Cakephp: Also a famous and simple framework. Enables the creation of simple or more complex applications. Easy to learn and have a great community.
Laravel : This is the name of the time, it is a VERY good framework, but at the same time complex for those who are learning. I recommend only when you are more familiar with PHP OO and MVC.
Zend Framework : This is undoubtedly the most complete of all. It is developed by the same team that takes care of PHP. It is a framework for robust applications. The learning curve is long, so I recommend only to those who already have a certain knowledge with PHP and MVC.
About the other languages (JAVA, .NET) I can not tell you because I have no experience with them. But what I can tell you is that once you understand programming and logic concepts, languages become just tools for you and that's what matters, solving problems.