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Instead of just executing a PHP script and calling Java methods from within such a script we can also call PHP functions and even PHP object methods from Java. First a litte PHP snippet: 
function useless($i) {
    return new foo($i);
}
 
class foo {
  var $val = '';
  function __construct($i) {
    $this->val = $i;
  }
  function bar($i) {
    return 'foo::bar::'.$i.' ('.$this->val.')';
  }
}
And a small Java program:
ScriptEngine eng = mgr.getEngineByName("turpitude");
Compilable comp = (Compilable)eng;
CompiledScript script = comp.compile(/*Source*/);
Invocable inv = (Invocable)script;
Object phpobj = inv.invokeFunction("useless", "Function Value");
Object retval = inv.invokeMethod(phpobj, "bar", "Method Value");
Even better: define an Intefarce in Java... 
public interface ExampleInterface {
    public String bar(String s);
}

ExampleInterface exint;
exint = inv.getInterface(phpobj, ExampleInterface.class);
exint.bar("interface call");
implement it in PHP... 
class foo {
  var $val = '';
  function __construct($i) {
    $this->val = $i;
  }
  function bar($i) {
    return 'foo::bar::'.$i.' ('.$this->val.')';
  }
}
and call it in Java: 
exint = inv.getInterface(ExampleInterface.class);
exint.bar("interface call");
see: InvocableSample.java

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