Simple datamap

DataMap.php

<?php
/**
 * DataMap
 */
class DataMap {

  /**
	 * This is the actual array that holds the data
	 *
	 * @var Array
	 */
	protected $_map_data = array();

	/**
	 * Creates a DataMap opbject
	 */
	public function __construct() {}

	/**
	 * You can prepopulate the DataMap by calling this method
	 *
	 * @param Array $data
	 */
	public static function fromArray($data) {
		$m = new DataMap();
		$m->addArray($data);
		return $m;
	}

	/**
	 * You can prepopulate the DataMap by calling this method
	 *
	 * @param String<JSON> $data
	 */
	public static function fromJson($data) {
		return self::fromArray(json_decode($data,true));
	}

	/**
	 * Add an array
	 *
	 * @param Array $data
	 */
	final public function addArray($data) {
		if ( is_array($data) ) {
			foreach ( $data as $key => $val ) {
				$this->set($key,$val);
			}
		}
	}

	/**
	 * Add a JSON object
	 *
	 * @param Strin<JSON> $data
	 */
	final public function addJson($data) {
		$this->addArray(json_decode($data,true));
	}
	
	/**
	 * Adds a key => value pair
	 * If is_array(value) -> DataMap::fromArray
	 *
	 * @param String $key
	 * @param mixed $val
	 */
	public function set($key, $val) {
		$this->_map_data[strtolower($key)] = (is_array($val)) ? DataMap::fromArray($val) : $val;
	}

	/**
	 * Return the value of $key
	 * if !isset($key) create a new DataMat at $key
	 *
	 * @param String $key
	 */
	public function get($key) {
		if ( !$this->is_set($key) ) {
			$this->set($key, new DataMap());
		}
		return $this->_map_data[strtolower($key)];
	}

	/**
	 * pseudo for isset
	 *
	 * @param String $key
	 * @return Boolean
	 */
	final public function is_set($key) {
		return isset($this->_map_data[strtolower($key)]);
	}

	/**
	 * pseudo for unset
	 *
	 * @param String $key
	 * @return void
	 */
	final public function un_set($key) {
		unset($this->_map_data[strtolower($key)]);
	}

	/**
	 * pseudo for toJson()
	 *
	 * @return String<JSON>
	 */
	public function toString() {
		return $this->toJson();
	}

	/**
	 * returns an Array representing this DataMap
	 * !recursion!
	 *
	 * @return Array
	 */
	public function toArray() {
		$a = array();
		foreach( $this->_map_data as $key => $value ) {
			if ( $value instanceof DataMap ) {
				$a[$key] = $value->toArray();
			} else {
				$a[$key] = $value;
			}
		}
		return $a;
	}

	/**
	 * returns a JSON string representing this DataMap
	 *
	 * @return String<JSON>
	 */
	public function toJson() {
		return json_encode($this->toArray());
	}

	/**
	 * returns an array of keys
	 *
	 * @return Array
	 */
	final public function keys() {
		return array_keys($this->_map_data);
	}

	/**
	 * returns the number of keys
	 *
	 * @return int
	 */
	final public function length() {
		return count($this->_map_data);
	}

	/**
	 * PHsP magic methods
	 */
	final public function __set($key, $val) {
		return $this->set($key,$val);
	}
	final public function __get($key) {
		return $this->get($key);
	}
	final public function __isset($key) {
		return $this->is_set($key);
	}
	final public function __unset($key) {
		$this->delete($key);
	}
	final public function __toString() {
		return $this->toString();
	}
}