Proper Array object

ProperArrayObject.php

<?
/**
 * Object do same as raw array in php(contract with ArrayObject):
 * $a[][]='a';
 * $a['b'][]='c';
 * $a['b'][][]='d';
 */
class ProperObjectArray implements \ArrayAccess, \Countable,\IteratorAggregate{

	protected $_array=[];



	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Whether a offset exists
	 * @link http://php.net/manual/en/arrayaccess.offsetexists.php
	 * @param mixed $offset <p>
	 * An offset to check for.
	 * </p>
	 * @return boolean true on success or false on failure.
	 * </p>
	 * <p>
	 * The return value will be casted to boolean if non-boolean was returned.
	 */
	public function offsetExists($offset)
	{
		return isset($this->_array[$offset]);
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Offset to retrieve
	 * @link http://php.net/manual/en/arrayaccess.offsetget.php
	 * @param mixed $offset <p>
	 * The offset to retrieve.
	 * </p>
	 * @return mixed Can return all value types.
	 */
	public function &offsetGet($offset)
	{
		if(isset($offset))
		// return reference to this el
			return $this->_array[$offset];
		// for proper subindex, ex. $a[][]='t'
		else {
			// create new empty var
			// and append array this this var reference, then return it
			$t=null;
			return $this->_array[]=&$t;
		}
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Offset to set
	 * @link http://php.net/manual/en/arrayaccess.offsetset.php
	 * @param mixed $offset <p>
	 * The offset to assign the value to.
	 * </p>
	 * @param mixed $value <p>
	 * The value to set.
	 * </p>
	 * @return void
	 */
	public function offsetSet($offset, $value)
	{
		// если указан ключ
		if(isset($offset))
			$this->_array[$offset]=$value;
		else
		// иначе дописываем
			$this->_array[]=$value;
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Offset to unset
	 * @link http://php.net/manual/en/arrayaccess.offsetunset.php
	 * @param mixed $offset <p>
	 * The offset to unset.
	 * </p>
	 * @return void
	 */
	public function offsetUnset($offset)
	{
		unset($this->_array[$offset]);
	}

	/**
	 * (PHP 5 &gt;= 5.1.0)<br/>
	 * Count elements of an object
	 * @link http://php.net/manual/en/countable.count.php
	 * @return int The custom count as an integer.
	 * </p>
	 * <p>
	 * The return value is cast to an integer.
	 */
	public function count()
	{
		return count($this->_array);
	}

	/**
	 * (PHP 5 &gt;= 5.0.0)<br/>
	 * Retrieve an external iterator
	 * @link http://php.net/manual/en/iteratoraggregate.getiterator.php
	 * @return Traversable An instance of an object implementing <b>Iterator</b> or
	 * <b>Traversable</b>
	 */
	public function getIterator()
	{
		return new \ArrayIterator($this->_array);
	}

	/**
	 * @return array
	 */
	public function toArray()
	{
		return $this->_array;
	}
}