Can I use both Java and PHP in the same application?

Thanks for reaching out! Though it's typically recommended that an application's backend is built out of as few languages as possible (preferably just one), it's definitely possible to have Java and PHP modules communicate with each other. For more information on this, I'd recommend giving the following links a read-through:

• This third-party forum that features a code example
• This PHP/Java bridge, as well as its F.A.Q.

Alternatively, you may simply wish to install a service such as Tomcat (a Java-based webserver) in a PHP-heavy environment such as cPanel. In that case, I'd strongly recommend following cPanel's official Tomcat installation guide.