Zend Studio 5.5 (PHP-Development IDE)

The only one IDE for PHP is the Zend Studio from zend.

Overview:
Zend Studio 5.5 is the only Integrated Development Environment (IDE) available for professional developers that encompasses all the development components necessary for the full PHP application lifecycle. Through a comprehensive set of editing, debugging, analysis, optimization and database tools, Zend Studio 5.5 speeds development cycles and simplifies complex projects.

Features in Zend Studio 5.5

Zend Platform Events List Integration
(using Zend Platform 3.0)
Mactel support
Anti-Aliasing support
Embedded Java Code Completion: Easily integrate Java into your code using the Code Completion features and define / specify additional Jars or Class folders that can be used for code completion
Source Control Status Decoration: View changes and current status of source controlled files from the Project view. Project file labels are automatically color coded according to their source control status
Zend Framework Integration: Seamlessly use integrated and customizable Zend Framework code completion and view the Framework functions list from the PHP Functions View
Remote WSDL File Support: Enables you to define your WSDL file as a remote URL file and get WSDL functions instantly

The price : $299,-

To get a trial version you can download it here. You need to create a free Zend account to access the downloads.

Screenshots :