Tip: you need a function in your .js, you need to install the plugin in your apps root directory, add a onclick action to trigger the function from the .js page the .js page will fire the process to the .php page.
Here’s the only decent web developer to php tutorial I could find to help me.
You’re going to also need a remote allow origin in your servers .php page.
Remember, add the camera, file and file-transfer plugins to your root directory.
Good luck. Happy coding.