it sud hav autocomplete feature... is there any like that...
If you are using Linux, then use gPHPEdit or Bluefish Editor. Both are BEST !!
If windows, then...hmm... I think DreamWeaver is good. Notpad++ have syntax highlighting. Then Editplus is also there.
Eclipse with PDT plugin.. Nothing beats it (freeware)..
Or try Aptana(based on Eclipse).
Supports PHP , HTML , JS , XSS and Ruby and Ruby on Rails too .
*www.aptana.com/
php designer 2008 is the the best.. I have tried dozen of editors just for PHP and settled to this one.