Quercus is Caucho Technology's fast, open-source, 100% Java implementation of the PHP language.

Introduction to Quercus

Quercus is Caucho Technology's fast, open-source, 100% Java implementation of the PHP language. Quercus is a feature of Caucho Technology's Resin Application Server and is built into Resin - there is no additional download/install. Developers using Resin can launch PHP projects without having to install the standard PHP interpreter (http://www.php.net) as Quercus takes on the role of the PHP engine.

What is Quercus

Quercus implements PHP 5 and is internationalization/localization (i18n/l10n) aware. Quercus natively supports Unicode and the new Unicode syntax of the up-and-coming PHP 6. Quercus implements a growing list of PHP extensions (i.e. APC, iconv, GD, gettext, JSON, MySQL, Oracle, PDF, Postgres, etc.). Many popular PHP applications will run as well as, if not better, than the standard PHP interpreter straight out of the box. The growing list of PHP software certified running on Quercus includes DokuWiki, Drupal, Gallery2, Joomla, Mambo, Mantis, MediaWiki, Phorum, phpBB, phpMyAdmin, PHP-Nuke, Wordpress, and XOOPS.

Resin with Quercus

Quercus is much more than just yet another PHP engine. Quercus is the first to tightly integrate the web server with a PHP engine. Quercus runs on top of Caucho Technology's Resin Application Server. As a result, PHP applications can automatically and immediately take advantage of Resin's advanced features like connection pooling, distributed sessions, load balancing, and proxy caching.

A New Java/PHP Architecture

Quercus is pioneering a new mixed Java/PHP approach to web applications and services. On Quercus, Java and PHP is tightly integrated with each other - PHP applications can choose to use Java libraries and technologies like JMS, EJB, SOA frameworks, Hibernate, and Spring. This revolutionary capability is made possible because 1) PHP code is interpreted/compiled into Java and 2) Quercus and its libraries are written entirely in Java. This lets PHP applications and Java libraries to talk directly with one another at the program level. To facilitate this new Java/PHP architecture, Quercus provides an API and interface to expose Java libraries to PHP.

Benefits of Quercus

Quercus and Quercus' PHP libraries are written entirely in Java, thereby taking the advantages of Java applications and infusing them into PHP. PHP applications running on Quercus are simply faster, easier to develop, more capable, more secure, and more scalable than any other PHP solution.

Performance - simply faster

• Quercus outperforms straight mod_php by about 4x for MediaWiki and Drupal.
• PHP developers can use Java tools like profilers to get in-depth information about the PHP program performance.

Development - fast, safe, and easy

• PHP extensions written in Java are fast, safe, and relatively easy to develop compared to those written in C. Since Java is the library language, developers won't need to be paranoid about third-party libraries having C-memory problems or segvs and are freed to concentrate on solving the objectives at hand.

Capability - powerful Java technologies at the developer's fingertips

• Quercus has the best of both worlds: PHP and Java. PHP applications can take advantage of Java technologies like JMS, EJB, SOA frameworks, Hibernate, and Spring.

Security - no more pesky C memory bugs

• All Quercus extensions libraries are coded in Java. Therefore, developers do not have to worry about C pointer overruns and segmentation faults from PHP extensions anymore.

Scalability - PHP for the masses, literally

• Thanks to Resin, PHP applications can beautifully scale to as many servers as desired.
• PHP applications can now enjoy connection pooling, distributed sessions, fail-safe load balancing, and proxy caching. These benefits require no change in the PHP code.

Quercus gives both Java and PHP developers a fast, safe, and powerful alternative to the standard PHP intepreter. Developers ambitious enough to use PHP in combination with Java will benefit the most from what Quercus has to offer.

Overview

Security

Java Integration

Resin Module

Module Status

List of PHP Applications

Troubleshooting/FAQ

Resources

• Caucho Forums, including a Quercus forum
• Caucho Bug Tracker
• Caucho Mailing Lists