I recomend you Codelobster PHP Edition.
It's most powerful among free code editors.
Some advantages of this editor are: intellectual autocomplete, FTP,
folding code, navigation with Ctrl for all links and descriptions and
Important feature of this editor is presence of special plugins for
Drupal CMS, Joomla CMS, Smarty template engine, JQuery library, CodeIgniter framework,
CakePHP framework, Facebook social network and WordPress blogging platform.
Also i want to pay your attention to the option Portable