Magische Methoden Overloading

    
    
overloading.php
    // __get / __set / __isset / __unset

    class Person {
        private $_data = array();

        public $vorname;

        public function __set($name, $value)
        {
            echo "set: $name<br>";
            $this->_data[$name] = $value;
        }

        public function __get($name)
        {
            return $this->_data[$name];
        }

        public function __isset($name)
        {
            return isset($this->_data[$name]);
        }

        public function __unset($name)
        {
            echo "unset: $name<br>";
            unset($this->_data[$name]);
        }
    }

    $person = new Person();
    $person->vorname = "Jens";
    //set und get nur wenn nicht vorher deklariert!
    $person->nachname = "Haake";

    if ($person->vorname) {
        echo $person->vorname . "<br>";
    } else {
        echo "Person hat keinen Vornamen";
    }

    unset($person->vorname);

    if ($person->nachname) {
        echo $person->nachname . "<br>";
    } else {
        echo "Person hat keinen Nachname";
    }

    unset($person->nachname);