PHP login and user management with message center is a very nice system if someone is looking for a message center in php and mysql, PHP message center have option so you can get notification in your email inbox as well when someone send you message on php login and user management with message center.
The benefit of using this system is admin have ability to see all users and have option to send message to all at once. Also admin can make user groups so that users can register for different groups admin have option in php message center to send message to different user groups.
Message can also be sent to individual or single user as well. By admin also if users know each other’s username or email address they can send message to each other as well.
This is very easy to implement so when user type first 2 3 letters of someone’s name system give suggestions of existing users with that name and make it easy to send messages.