1)   PHP Expert Editor 4.0
PHP Expert Editor is a tool for writing, editing, and debugging PHP scripts and HTML pages. It has internal browser, Debugger, Code Explorer, File Explorer, a built-in FTP client, Project Explorer, customizable Code Templates, etc.
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 2)   Zend Studio 5.5
Zend Studio is the only Integrated Development Environment (IDE) available for professional developers that encompasses all the development components necessary for the full PHP application lifecycle.
Zend, PHP, IDE, DevelopmentEnvironment, Debugger, Profileintegration, editor, phpeditor, codecompletion,

 3)   Zend Studio for Linux 5.5
Zend Studio is the only Integrated Development Environment (IDE) available for professional developers that encompasses all the development components necessary for the full PHP application lifecycle.
Zend, PHP, IDE, DevelopmentEnvironment, Debugger, Profileintegration, editor, phpeditor, codecompletion,

 4)   Zend Studio for Mac 5.5
Zend Studio is the only Integrated Development Environment (IDE) available for professional developers that encompasses all the development components necessary for the full PHP application lifecycle.
Zend, PHP, IDE, DevelopmentEnvironment, Debugger, Profileintegration, editor, phpeditor, codecompletion,