How does PHP call java code?

How does PHP call java code? Java php call

New user request ~

Now there is a java file. for example, there is this function in it.
String test (String s ){
String s2
// Do something deal with data base
Return s2;
}

There is also an html page. click a button to pass a string obtained from the page to the java function. The java function returns the result and displays it.

I don't know if this information is useful: I am using WAMPSever.

How can I enable PHP at the front end to call this java function? Thank you!

Reply to discussion (solution)

Tomacat + apache?

Then, your java code must be embedded!

And then use php to call it through socket or curl,

It should be enough.

Why java?

Yes. why java.

1. php curl calls Java Servlet
2. write a WebService in Java and call it in PHP.