Example WordPress user model

user.php

<?php

class User {

	public $ID;

	public $_user;

	public $attributes = [
		'description',
		'first_name',
		'last_name',
		'prefixed' => '_prefix_',
	];

	public $virtual = [
		'email',
		'fullName',
		'username',
	];

	public function __construct($ID = null) {
		$this->ID = $ID ?? self::id();

		$this->_user = new WP_User($this->ID);

		foreach ($this->attributes as $k => $v) {
			$attribute = is_string($k) ? $k : $v;
			$prefix = is_string($k) ? $v : '';
			$this->$attribute = $this->meta($attribute, $prefix);
		}
	}

	public function __get($attribute) {
		if (in_array($attribute, $this->attributes)) {
			return $this->attribute;
		} elseif (in_array($attribute, $this->virtual)) {
			return call_user_func([$this, '_get' . ucfirst($attribute)]);
		}
	}

	public function _getEmail() {
		return $this->_user->user_email;
	}

	public function _getFullName() {
		return $this->first_name . ' ' . $this->last_name;
	}

	public function _getUsername() {
		return $this->_user->user_login;
	}

	public function meta($key, $prefix = '_prefix_') {
		return get_user_meta($this->ID, $prefix . $key, true);
	}

	public function setMeta($key, $value = null, $prefix = '_prefix_') {
		return update_user_meta($this->ID, $prefix . $key, $value);
	}

	public static function id() {
		return get_current_user_id();
	}

	public static function loggedIn() {
		return is_user_logged_in();
	}

	public static function find($user_id = null) {
		return new self($user_id);
	}

	public static function current() {
		return new self();
	}

	public static function getByLogin($login) {
		if (is_email($login) && ! username_exists($login)) {
			$user = get_user_by('email', $login);
		} else {
			$user = get_user_by('login', $login);
		}

		if ($user) {
			return new self($user->ID);
		}

		return false;
	}

}