JetBrains
JetBrains delivers intelligent software solutions that make developers more productive by simplifying the challenging tasks, automating the routine ones and developing the best development practices. We are creating IntelliJ IDEA for Java, ReSharper for .Net, RubyMine for Ruby and now PhpStorm — IDE for PHP.
JetBrains PhpStorm is a lightweight and intelligent development environment providing advanced PHP coding support with refactoring capabilities, graphical debugger, test runner and a powerful HTML, JavaScript and CSS editor.
Download PhpStorm from http://www.jetbrains.com/phpstorm/