How to connect to external database for PhoneGap - php

I am using a simple log in page as a start page to my application. When details entered, the app will check details with an external mySQL database and come back to connect or give error message. I am doing all these via php and all files are with .php extension.
But how do I do this with PhoneGap? I read around and php is not recognized on PhoneGap and moreover I can no longer place my php files on the server side. All files are going to be compiled via phonegap build which would sit on the mobile device itself.
How do I connect to my external mySQL database for PhoneGap? Seen the following guide which does uses a php script. I tried and it is not working. I don't get how it would work anyway since I can't place my php script on a server side.
Guide

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I created an app using PHP and it runs fine using the HTTP address in the Webview object.
When using locally, the PHP script does not work (putting all files in assets).
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To clarify, all HTML content of the .php page will be used locally but when needed PHP code it will connect the webserver.
Thanks!
If you use a php content you should have Internet connection because php codes work on server side not local devices(some apk's install mysql+php in your android device but if you want to publish your apk this way wont work in all devices on local.)
Also if you want to make an offline project why dont you use javascript "To clarify, all HTML content of the .php page will be used locally"
Here you can download phpforandroid.apk to work on the local Click Here

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Use the web service. If your client has logic to parse the HTML, it can break when the web page changes. The web service can absorb this change and make corrections, but your client cannot. Not unless you release another version of your app, and that can be a pain.

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