SafeNullClass.php

SafeNullClass.php

<?php

/**
 * Created by PhpStorm.
 * User: kwant
 * Date: 26.08.17
 * Time: 19:50
 *
 * attempt to create NullObject in php
 * this object does nothing
 * also this object doesn't throw any error
 *
 *
 */
class SafeNullClass implements Countable, IteratorAggregate, ArrayAccess, JsonSerializable
{
    public function __construct(){}

    function __call($name, $arguments){}

    public static function __callStatic($name, $arguments){}

    function __get($name){}

    function __set($name, $value){}

    function __isset($name)
    {
        return false;
    }

    function __unset($name){}

    function __toString()
    {
        return "";
    }

    function __invoke(){}

    public function getIterator()
    {
        return new EmptyIterator();
    }

    public function offsetExists($offset)
    {
        return false;
    }

    public function offsetGet($offset){}

    public function offsetSet($offset, $value){}

    public function offsetUnset($offset){}

    public function count()
    {
        return 0;
    }

    function jsonSerialize()
    {
        return null;
    }
}

SafeNullClassRecursive.php

<?php

/**
 * Created by PhpStorm.
 * User: kwant
 * Date: 26.08.17
 * Time: 20:11
 *
 * recursive version of NullObject
 * you can also write someting like
 *   $null->property->getIt()['key']->yay()['x'];
 * without getting any errors
 *
 */
class SafeNullClassRecursive extends SafeNullClass
{
    public function __get($name)
    {
        return $this;
    }

    public function offsetGet($offset)
    {
        return $this;
    }
    public function __call($name, $arguments)
    {
        return $this;
    }
    public function __invoke()
    {
        return $this;
    }
}