PHP Editors, random snippet

I've been searching high and low for reviews and trials of as many applications there are out there for writing PHP. I found some promising ones, but nothing has leapt out at me yet.
Currently I use HomeSite. More simply because it's what I used 10 years ago, than any other reason. Now I think I'd like to try an IDE.

Here are the apps I'm reviewing:

1. Programmers Notepad 2
2. Zend Studio
3. EnginSite
4. PHP Coder

I'll post my reviews once they are completed.

Code snippet for email address validation:

function is_email_valid($email) {
if(eregi("^[a-z0-9\._-]+@+[a-z0-9\._-]+\.+[a-z]{2,3}$",
    $email)) return TRUE;
else return FALSE;
} 

BFN!