Quercus is an implementation of the PHP (version 5.3) programming language in pure Java.
Quercus is an implementation of the PHP (version 5.3) programming language in pure Java and runs ontop of common java application servers such as Tomcat. It is possible to make calls to java from the php-code:
<?php
import java.util.Date;
$a = new Date(123);
echo $a->time;
?>
Example from the quercus website.