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Monday March 19, 2007

Experiments with the JSR-223 compatible Quercus PHP engine

There's a lot of hype for all sorts of Java scripting engines at the moment. For myself I've made some experiments with groovy/grails. Today I've found the PHP Quercus engine from Caucho.com, which is licensed under GPL and I also tried to use it as a JSR-223 scripting engine. As the goal of the test, I want to generate some text from a PHP file, which prints out some PHP variables ($x, $y) in a PHP double quoted string.

Therefore I opened the downloadable *.war file from the Quercus 3.1 snapshot (alpha) with my ZIP tool and extracted:

• quercus.jar
• resin-util.jar

in the /lib classpath of a newly created quercus.script.test Eclipse project.

Additionally I added a servlet-api.jar from a tomcat 6.x installation to the project's classpath.

The Quercus standard JSR-223 script engine is implemented in the package com.caucho.quercus.script.

Note: if you're not using JDK 1.6, but only JDK 1.5, you'll also need the javax.scripting.* JSR 223 (see link at the end of the blog entry). I also didn't install necessary additional *.jar libraries for Quercus MailModule and UnicodeModule classes.

The Test.java file below now creates the following output

hello world
Hello - World
Hasta la vista Baby

Test.java file (updated: it now reflects the comments from baennaeck)

package info.bliki.quercus.script.test;

import java.io.FileReader;
import java.io.StringWriter;

import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

public class Test {

	public static void main(String[] args) {
		ScriptEngineManager scriptManager = new ScriptEngineManager();

		Object php2javaResult = null;
		ScriptEngine phpEngine = scriptManager.getEngineByExtension("php");
		ScriptContext context = phpEngine.getContext();
		
		try {
			context.setWriter(new StringWriter());
			php2javaResult = phpEngine.eval("<?php echo \"hello world\"; ?>",
					context);
			StringWriter writer = (StringWriter) context.getWriter();
                        // show output from PHP script in console:
		        System.out.println(writer.toString());
		} catch (Exception ex) {
			ex.printStackTrace();
		}

		try {
			context.setWriter(new StringWriter());
			phpEngine.put("x", "Hello");
			phpEngine.put("y", "World");
			php2javaResult = phpEngine.eval("<?php echo \"$x - $y\"; ?>", context);
			StringWriter writer = (StringWriter) context.getWriter();
			System.out.println(writer.toString());
		} catch (Exception ex) {
			ex.printStackTrace();
		}

		try {// file test
			context.setWriter(new StringWriter());
			//redefine variable in ENGINE_SCOPE x,y:
			phpEngine.put("x", "Hasta la vista");
			phpEngine.put("y", "Baby");
			// the following file contains the line: <?php echo "$x $y"; ?>
			php2javaResult = phpEngine
					.eval(new FileReader(
							"C:\\temp\\echo_test.php"), context);
			StringWriter writer = (StringWriter) context.getWriter();
			System.out.println(writer.toString());
		} catch (Exception ex) {
			ex.printStackTrace();
		}

	}
}

BTW: the Quercus phpinfo() implementation gives the following output:

<h1>Quercus</h1><pre>PHP Version => 5.2.0
System => Windows XP 5.1 x86
Build Date => 20061220T1222
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
</pre>

Related links:

• http://quercus.caucho.com/
• http://weblogs.java.net/blog/ludo/archive/2007/03/100_java_quercu.html
• http://blogs.sun.com/alexismp/entry/php_in_glassfish_first_steps
• http://jcp.org/aboutJava/communityprocess/pr/jsr223/

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