I like this editor very much. It works fast and has advanced autocomplete for HTML, CSS, JS and PHP. Also it includes special plug-ins for all popular frameworks: Drupal, WordPress, Joomla, Yii, jQuery, Angular and so on.
MAMP - MAMP is the abbreviation for Macintosh, Apache, MySQL, and PHP. It is a reliable application with its four components that allows you to access the local PHP server as well as the database server (SQL).
Kodiak PHP - Kodiak PHP can run any PHP code directly (offline) on your iPad, no need for an internet connection.
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
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.
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
NuSphere PhpEd - PhpED - PHP IDE integrated development environment for developing web sites using PHP, HTML, Perl, JScript and CSS that combines a comfortable editor, debugger, profiler with the MySQl, PostrgeSQL database support based on easy wizards and tutorials.