PHP and Java interoperablity

I am working on windows using tomcat 6 and PHP/Java Bridge. I know how t开发者_运维问答o access a Java file from PHP but how do we do it the other way i.e accessing PHP from Java

<?php
require_once("java\Java.inc");
$systemInfo = new Java("java.lang.System");
print "Total seconds since January 1, 1970: 
".$systemInfo->currentTimeMillis();
?>

Also how do I access Java classes that are created by me. Do I write a CLASSPATH env variable or change the php.ini config file?

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I think you should look at JPHP, which embeds PHP into the Java VM.