Dev-PHP IDE - Dev-PHP is a well-featured integrated development environment (IDE).
Kodiak PHP - Kodiak PHP can run any PHP code directly (offline) on your iPad, no need for an internet connection.
phpDesigner - Powerful PHP IDE and PHP editor with built-in HTML, CSS and JavaScript editor. Fast. Powerful.
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
Servo - PHP builder application which uses a combination of a powerful editor and drag & drop to make...
Rapid PHP - Rapid PHP editor is the world's fastest and lightest PHP IDE for Windows with code intelligence and tools for PHP, HTML, CSS, and JavaScript, including PHP debugger, FTP/SFTP client, UTF-8 support and more.