Regarding PHP support the M1 contains new features, which were already mentioned on this blog and also many bug fixes. The PHP distribution has only 15 MB download size and I suggest to use M1 before Early Access.
We are waiting for your feedback. It's important for us to know, how you work, what is your workflow and what you need and expect. Help us to create useful PHP IDE. You can leave your message here as a comment or write to firstname.lastname@example.org . You can subscribe for this mailing list here (is the last one), if you are logged in or you can send an email to email@example.com.