Mine

<?php

/**
 * user class
 * 
 * this is intended to be a base user class that others extend
 * could possibly be an 'abstract' class, except I think I
 * want to have some implementation stuff in here to share
 * 
 */

class base_user {
	
	public $name;
	public $level;
	public $permissions;
	private $__authenticated = false;
	public $info = array();
	public $session = array();
	
	public function base_user() { 
	}
	
	/**
	 * determine type of user
	 * 
	 * @param string Type to check against (staff/org/etc)
	 * @return boolean
	 */
	public function isType($type){ 
		if(@$this->info['type']==$type) { 
			return true;
		} else {
			if(@$this->type==$type) {
				return true;
			} else {
				return false;
			}
		}
	}
	
	/**
	 * return boolean true/false if user is authenticated or not
	 * 
	 * @return boolean
	 */
	public function isAuthenticated() {
		return $this->__authenticated;
	}

	/**
	 * get info about the user
	 * this is the set of key/value pairs from the db row with the user info in it
	 * may evolve in to more info
	 *
	 * @param String $key
	 * @return mixed
	 */
	public function getInfo($key) { 
		if(@$this->info[$key]!='') { 
			return @$this->info[$key];
		} else {
			return @$this->$key;
		}
	}
	
	/**
	 * authenticate the user and return a user object
	 * we'll either return a basic base_user object 
	 * or a user_site,user_org,user_staff or user_registrar
	 * object based on the user's type
	 * 
	 * @static 
	 * 
	 * @param string username
	 * @param string password
	 * @return base_user user object
	 */
	public function authenticate($user, $password) {
		$db = new xdb();
		$rows = $db->queryGetAll("select * from ".config::get("tbl_site")." where 
		username=':?:' and password=SHA1(':?:')", array($user,$password));
		
		if(count($rows)!=1) { 
			$_SESSION['user'] = new base_user();
		} else {
			$user = base_user::loadById($rows[0]['ID']);
			$_SESSION['user'] = $user;
		}		
		
		return $_SESSION['user'];	
	}
	
	
	/**
	 * load by id
	 * 
	 * @param string ID
	 * @return base_user Appropriate subclass of base_user
	 * 
	 */
	public function loadById($id) { 
		$db = new xdb();
		$rows = $db->queryGetAll("select * from ".config::get("tbl_site")." where id=':?:' ", array($id));
		if(count($rows)!=1) { 
			$user = new site();
		} else {
			$row = $rows[0];
			$userClassName = "user_".$row['type'];
			// need to call this to fix typo with addEnrollments - there might be others too
			$row['userCapabilities'] = base_user::fixCapabilities($row['userCapabilities']);
			$user = new $userClassName($row);
			$user->__authenticated = TRUE;
			$user->setPermissions($row['userCapabilities']);
			$user->name = $user->getInfo('name');
			$user->info['currentUserID'] = $row['username'];
			$user->info['currentUser_access'] = $row['type'];
			$user->info['siteId'] = $row['ID'];
		}
		
		return $user;
	}

	
	/**
	 * load by any key
	 * 
	 * @param string Key to search for - what column name to use
	 * @param string ID - value to search for
	 * @return base_user Appropriate subclass of base_user
	 * 
	 */
	public function loadByKey($key,$value) { 
		$db = new xdb();
		$rows = $db->queryGetAll("select * from ".config::get("tbl_site")." where 
			$key=':?:' ", array($value));
		if(count($rows)!=1) { 
			$user = new base_user();
		} else {
			$row = $rows[0];
			$userClassName = "user_".$row['type'];
			// need to call this to fix typo with addEnrollments - there might be others too
			$row['userCapabilities'] = base_user::fixCapabilities($row['userCapabilities']);
			$user = new $userClassName($row);
			$user->setPermissions($row['userCapabilities']);
			$user->name = $user->getInfo('name');
			$user->info['currentUserID'] = $row['username'];
			$user->info['currentUser_access'] = $row['type'];
			$user->info['siteId'] = $row['ID'];
		}
		
		return $user;
	}
	
	
	/**
	 * fix the userCapabilities string
	 * @param string original userCapabilities string
	 * @return string fixed string
	 * 
	 */
	function fixCapabilities($string) { 
		$newString = str_replace("addEnrollemnts","addEnrollments", $string);
		return $newString;
	}
	
	/**
	 * Set the permission strings for this user
	 *
	 * @param array $perms
	 */
	public function setPermissions($perms) { 
		$this->permissions = explode(",",$perms);		
	}
	
	/**
	 * return boolean if user has permission string or not
	 *
	 * @param string $permission
	 * @return boolean
	 */
	public function hasPerm($permission) {
		if(in_array($permission, $this->permissions)) { 
			return true;	
		} else {
			return false;
		}
	}
	
	static public function get() {
		return $_SESSION['user'];
	}
	
}


?>