So, essentially you only want to have your web page available, that Android devices access?
Your client is a browser and browser just doesn't send out that kind of information. Look at the request headers for what's available. And this would be a huge privacy issue if it did.
So if you really have that kind of requirements, you have to create your own Android app. And while there is Quercus (that can run PHP on JVM), I think a mash-up browser with Android Java SDK would be a lot easier to accomplish. PHP5 is very similar in syntax to Java anyways.
Check http://developer.android.com/reference/android/webkit/WebView.html for the browser-side and How to get the device's IMEI/ESN programmatically in android? for IMEI.