Raspberry Pi NFC is a simple example from my meet.php presentation. The example shows how to create a php NFC service. The service read your card (or phone) ID and save it in a database. The id can be use to recognize a user. The aplication implement web interface to show read cards history. I use knockout.js and php rest api to update information automaticaly.
To run the example you should install: *apache *php module *mysql *libNFC *nfc-tools
After install you can use nfcCards.sql file to create database. And run nfcService.php (with sudo permissions):
sudo php nfcService.php
Now you can see result by www.
The example was by tested with ACR122 NFC Reader. I use Raspberry Pi v2.0, raspbian and wifi card. Works properly with other systems and hardware.