Dev-PHP IDE - Dev-PHP is a well-featured integrated development environment (IDE).
CodeLobster PHP Edition - CodeLobster - Free portable PHP IDE with support Drupal, Smarty, Twig, WordPress, Joomla, JQuery, CodeIgniter, HTML, CSS, JavaScript, AngularJS, CakePHP, Facebook, Laravel, Phalcon, Symfony, Yii
phpDesigner - Powerful PHP IDE and PHP editor with built-in HTML, CSS and JavaScript editor. Fast. Powerful.
Kodiak PHP - Kodiak PHP can run any PHP code directly (offline) on your iPad, no need for an internet connection.
Servo - PHP builder application which uses a combination of a powerful editor and drag & drop to make...
WritePHPOnline.Com - WritePHPOnline.Com is an online site that enables you to write code in PHP and view its output.