What am I missing to get a PHP ScriptEngine in Java

Question

I try to get a PHP ScriptEngine from the ScriptEngineManager, but getEngineByName("php") returns null. The following unit test works, if I replace "php" with "javascript", but it fails for "php".

import static org.junit.Assert.*;
import org.junit.Test;
import javax.script.*;

public class ScriptEngineTest {
    @Test
    public void executeCommand() throws Exception {
        ScriptEngine engine = new ScriptEngineManager().getEngineByName("php");
        assertNotNull(engine);
    }
}

I must be missing something obvious. I know, that Rhino comes with Java 6 and is behind the javascript engine. Where do I get this for PHP?

EDIT:

I made my first step forward. On http://php-java-bridge.sourceforge.net/pjb/installation.php there is a download link for JavaBridgeTemplate5442.war. I unzipped this war file. Under WEB-INF/lib/ I found the jar files

• JavaBridge.jar
• php-script.jar
• php-servlet.jar

When I put JavaBridge.jar in my class path, the unit test works. (Probably I will also need php-script.jar to actually execute PHP code.)

Answer 1

Scripting engines available under JSR 223 are listed here (bottom of the page).

Current implementations of PHP include Quercus and PHP to Java bridge.