As far as php is concerned ...Dreamweaver or pspad is gud... But sadly both of these application will work in windows.... so u can try installing these applications in ubuntu using wine....
My personal choice is NetBeans , Eclipse .
I think netbeans is best even though it has slow startup
Also try aptana its specially made for web development.
I'm a PHP developer, IMO NetBeans is great with lots of code auto-completion, including XHTML and Javascript code hinting. Zend Studio is great, but not free.
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