Adobe Dreamweaver: Adobe hasn't left a stone unturned in the field of web development. Dreamweaver (the editor from Adobe that is used for developing applications in PHP, HTML, Cold Fusion, etc) provides excellent support for PHP and offers all the features a good standard PHP editor needs. But the editor is costs a fortune. Many other editors are available that do the same job but at a lesser rate or for free!
Expression Web: Expression Web from Microsoft is a very clean editor and doesn't offer a cluttered environment like many other editors. However there is no support for content management systems in Expression Web. This is really a huge drawback because the popular content management systems like Wordpress, Drupal, Joomla, etc are designed using PHP and the support of a PHP editor to edit the content management systems to customize to one's need is important. Hence Expression Web as a PHP editor is good only for the starters who develop in PHP.
Zend PHP: With full support for PHP and MySQL Probably the best PHP editor our there. It is fast and getting around the editor is easy. Zend Studio has fantastic features like code refactoring, semantic analysis, features that support JavaScript libraries like Prototype and jQuery, etc. It is probably the best PHP Editor (free or paid) that help the developer write valid codes with ease that go by the W3 Consortium's standards.
Visit Zend Studio to know more.
PHP Designer: A good PHP editor although not a high end one but good for basic purposes. It has the basic features to create, edit, debug, analyze and publish PHP, HTML, CSS and JavaScript. PHP Designer offers support for JavaScript libraries like jQuery, Ext JS, YUI, Dojo, MooTools, Prototype and all major PHP frameworks. It runs on Windows 7, 32 bit and 64 bit Vista and XP.
Features: Syntax highlighters, Debug tools for PHP, Syntax check for PHP, HTML, CSS, JavaScript, Project and file management, User interface (themes are supported.)
PHP Designer offers a 21 day trial period. The commercial license costs € 70. Download PHP Designer here.
PHPEdit: Offers basic features and is not costly as Zend studio or Dreamweaver. If you work with the Symfony framework, this is a really good editor for applications built over Symfony framework.
Download Size (current stable version 3.6.6) - 14.75 MB
Visit PHPEdit.com to download PHP Edit