Quercus - Java implementation of PHP
Quercus is Caucho Technology's 100% Java implementation of PHP 5. Quercus comes with many PHP modules and extensions like PDF, PDO, MySQL, and JSON. Quercus allows for tight integration of Java services with PHP scripts, so using PHP with JMS or Grails is a quick and painless endeavor. With Quercus, PHP applications automatically take advantage of Java application server features just as connection pooling and clustered sessions.
Quercus implements PHP 5 and a growing list of PHP extensions including APC, iconv, GD, gettext, JSON, MySQL, Oracle, PDF, and Postgres.PHP code is interpreted/compiled into Java and Quercus and its libraries are written entirely in Java. This helps PHP application to use JMS, EJB, Hibernate, Spring and other frameworks and applications of Java.