1) To register for a PhD in the EU you need a valid Master's degree from some university. Most of the "usual" universities are perfectly valid, I have never seen anything weird in this respect. Then you also need a valid VISA for Europe. There are several options here, like visas targeted only to one state or the whole EU, working/studying visas, etc. Language requirements are also important. Minimum is a good working level of English, but if on top you speak the local language, then it's of course a plus.
2) The PhD itself varies a lot depending on the field, institution and director. But usually you need a reasonable number of papers and original results. The more, the better. The evaluation of the PhD is also a bit different depending on the country. In some countries it's essentially a yes/no evaluation, while in others you get an actual rank. As an example, in my field (theoretical physics) I would say that one needs at least a couple of papers, 4-5 as an average for going well, in good journals. Ideally you should also have given some seminars, collaborated/visited some international group, etc. In the end it's your director who decides if you are ready to present the thesis or not.
3) Concerning the number of years: grants in the EU are now for 3 years almost everywhere, but most of the people take 4+ years to finish. Many people take some time to ramp-up to PhD level, and therefore most of the interesting work comes usually when you are towards the end.
1) To register for a PhD in the EU you need a valid Master's degree from some university. Most of the "usual" universities are perfectly valid, I have never seen anything weird in this respect. Then you also need a valid VISA for Europe. There are several options here, like visas targeted only to one state or the whole EU, working/studying visas, etc. Language requirements are also important. Minimum is a good working level of English, but if on top you speak the local language, then it's of course a plus.
2) The PhD itself varies a lot depending on the field, institution and director. But usually you need a reasonable number of papers and original results. The more, the better. The evaluation of the PhD is also a bit different depending on the country. In some countries it's essentially a yes/no evaluation, while in others you get an actual rank. As an example, in my field (theoretical physics) I would say that one needs at least a couple of papers, 4-5 as an average for going well, in good journals. Ideally you should also have given some seminars, collaborated/visited some international group, etc. In the end it's your director who decides if you are ready to present the thesis or not.
3) Concerning the number of years: grants in the EU are now for 3 years almost everywhere, but most of the people take 4+ years to finish. Many people take some time to ramp-up to PhD level, and therefore most of the interesting work comes usually when you are towards the end.