We'll need to check from the beginning starting with the installation. Recommended installation process is to install using a shell script - install.sh
See here : https://docs.appdynamics.com/display/PRO42/Install+the+PHP+Agent+using+a+Shell+Script
Next, we'll need to validate the installation or resolve any installation issue. See here : https://docs.appdynamics.com/display/PRO42/Resolve+Installation+Issues+for+PHP
Once you restart your apache/nginx webserver, you'll see a java proxy process (lightweight java process to communicate with the controller).