It's an abstract class that works magic methods and properties

AbstractModel.php

<?php

class AbstractModel {

    protected $fillable = array();
    protected $data = array();

    // set magicaly the data attributes
    protected function __set($name,$value) {
        $this->data[$name] = $value;
    }//__set()

    protected function __get($name) {
        if(array_key_exists($name, $this->data)) {
            return $this->data[$name];
        }

        return null;
    }//__get()

    protected function __isset($name) {
        return isset($this->data['name']);
    }

    protected function __unset($name) {
        unset($this->data[$name]);
    }//__unset()

}