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Here are the steps to run php in tomcat :

1. Download tomcat and unzip the archive where you want (=> TOMCAT_DIR)
2. Create the following directories : TOMCAT_DIR/webapps/testPHP
3. If necessary, create directory TOMCAT_DIR/common/lib (it seems, at least with tomcat 6, that the directory is no more created)
4. Edit the file TOMCAT_DIR/conf/catalina.properties and modify the line for property shared.loader :
shared.loader=${catalina.home}/common/classes,${catalina.home}/common/lib/*.jar
5. Edit the file TOMCAT_DIR/conf/web.xml and add the lines mentionned below (see 'lines to add to web.xml of your tomcat installation')
6. To download quercus ( a php 5 engine written in pure java), you must in fact download resin because quercus can't be downloaded separately
7. Unzip the archive to RESIN_DIR
8. Copy the 2 files RESIN_DIR/lib/resin-util.jar and RESIN_DIR/lib/quercus.jar to the directory TOMCAT_DIR/common/lib (see step 3)
9. Now, in the directory TOMCAT_DIR/webapps/testPHP, create a file named test.php with the following content :
<?php phpinfo(); ?>
10. start tomcat (TOMCAT_DIR/bin/startup.sh) if you have not already done
11. Enter the following url in your web browser : http://localhost:8080/testPHP/test.php
12. You should get a screen like the following (values may vary) :

------------ expected result screen ---------------------------------
Quercus

PHP Version => 5.2.0
System => Linux 2.6.20-16-generic amd64
Build Date => 20070628T2777
Configure Command => n/a
Server API => CGI
Virtual Directory Support => disabled
Configuration File (php.ini) Path => WEB-INF/php.ini
PHP API => 20031224
PHP Extension => 20041030
Debug Build => no
Thread Safety => enabled
Registered PHP Streams => php, file, http, https

PHP Variables
............
----------------------------------------------------------------

------------ lines to add to web.xml of your tomcat installation ---------

quercus

com.caucho.quercus.servlet.QuercusServlet

text/html

quercus

*.php

----------------------------------------------------------------

And Voila, you have a running php engine in your tomcat webserver :-)