Computers & IT (Non-Engg)

Yes, you are eligible.
Starting from the point of view, Hacking doesnt requires eligibility of academics. Hacking is just a skill which requires, Coding Knowledge, Network Knowledge, Server side Scripting Knowledge, Computer Hardware Knowledge and Testing Knowledge. Coming to the part, if you saw the articles, the children are around 5 - 11 years of age are hacking networks, finding zero day flaws in software etc. So this shows hacking doesnt require any academic courses. learning hacking through any certification such as EC - Council CEH, (ISC)2s CISSP, CISA and CISM from ISACA and OSCP from Offensive Security will improve the professional skills of hacking.

You can definitely get a good job if you are good at PHP, but the trends all over the world shows that PHP market value is declining gradually, hence it's not a good option to invest time in the same in the long term. Java, JavaScript, C#, C+ still have good market value.
But in some sense, it doesn't matter. You shouldn't try to predict what language is going to be most popular.
You should adapt as the market changes, and learn new languages as they become popular.
There will always be a new language. Every few years, the fashions change. If you want to have longevity as a software developer, you should develop the skill of learning new skills.

You can definitely get a good job if you are good at PHP, but the trends all over the world shows that PHP market value is declining gradually, hence it's not a good option to invest time in the same in the long term. Java, JavaScript, C#, C+ still have good market value.
But in some sense, it doesn't matter. You shouldn't try to predict what language is going to be most popular.
You should adapt as the market changes, and learn new languages as they become popular.
There will always be a new language. Every few years, the fashions change. If you want to have longevity as a software developer, you should develop the skill of learning new skills.