Simple User class with supporting Address class. This serves as a basic starting point for developing a quick user class for projects and can be expanded on further.

user.php

<?php

/**
 * Basic user class to hold some standard data and designed to be expanded and altered as necessary.
 */
class User {
	private $userID = 0;
	private $firstName = '';
	private $lastName = '';
	private $address = null;
	private $primaryEmail = '';
	private $secondaryEmail = '';
	private $primaryPhone = '';
	private $secondaryPhone = '';

	public function __construct() {
		$this->address = new Address();
	}

	// Accessors (getters)
	public function getId() { return $this->userID; }
	public function getFirstName() { return $this->firstName; }
	public function getLastName() { return $this->lastName; }
	public function getFullName() { return $this->firstName . ' ' . $this->lastName; }
	public function getAddress() { return $this->address; }
	public function getPrimaryEmail() { return $this->primaryEmail; }
	public function getSecondaryEmail() { return $this->secondaryEmail; }
	public function getPrimaryPhone() { return $this->primaryPhone; }
	public function getSecondaryPhone() { return $this->secondaryPhone; }

	// Mutators (setters)
	public function setId($id = 0) {
		if (is_numeric($id)) {
			$intId = (int)$id;

			// We accept zero to show dirtiness or invalid user. Change as required.
			if ($intId >= 0) {
				$this->userID = (int)$id;
			} else {
				throw new Exception('User ID must be greater than or equal to 0.');
			}
		} else {
			throw new Exception('User ID must be numeric.');
		}
	}

	public function setFirstName($firstName) {
		if (is_string($firstName)) {
			$this->firstName = trim(strip_tags($firstName));
		}
	}

	public function setLastName($lastName) {
		if (is_string($lastName)) {
			$this->lastName = trim(strip_tags($lastName));
		}
	}

	public function setAddress($address = null) {
		if (is_object($address) && is_a($address, 'Address')) {
			$this->address = $address;
		} else {
			throw new Exception('Invalid address specified.');
		}
	}

	public function setPrimaryEmail($email) {
		if (is_string($email) && $this->validateEmail(trim($email))) {
			$this->primaryEmail = trim($email);
		} else {
			throw new Exception('Invalid user primary email address specified.');
		}
	}

	public function setSecondaryEmail($email) {
		if (is_string($email) && $this->validateEmail(trim($email))) {		
			$this->secondaryEmail = trim($email);
		} else {
			throw new Exception('Invalid user secondary email address specified.');
		}
	}

	public function setPrimaryPhone($phoneNumber) {
		if (is_string($phoneNumber)) {
			$this->primaryPhone = trim(strip_tags($phoneNumber));
		} else {
			throw new Exception('Invalid user primary phone number specified.');
		}
	}

	public function setSecondaryPhone($phoneNumber) {
		if (is_string($phoneNumber)) {
			$this->secondaryPhone = trim(strip_tags($phoneNumber));
		} else {
			throw new Exception('Invalid user secondary phone number specified.');
		}
	}


	// Private helper functions
	private function validateEmail($email) {
		// preg_match needed for PHP prior to 5.3
		return filter_var($email, FILTER_VALIDATE_EMAIL) && preg_match('/@.+\./', $email);
	}
}


/**
 * Simple structure class for holding basic user address information.
 */
class Address {
	public $address1 = '';
	public $address2 = '';
	public $city = '';
	public $postal = '';
	public $stateProvince = '';
	public $country = '';
	private $isBusiness = false;

	public function setIsBusiness($isBusiness = false) {
		$this->isBusiness = ($isBusiness !== false);
	}
}