Extends codeigniter input class to accept put and delete requests

MY_Input.php

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class MY_Input extends CI_Input {

    /**
     * Variables
     * 
     */
    
    protected $delete;
    protected $put;
    protected $post;
    
	// --------------------------------------------------------------------
	
    /**
     * Constructor
     * 
     */
    function __construct() 
    {
    	log_message('debug', "MY_Input Class Initialized");
    	
        parent::__construct();
        
        //get request type or override type
        if ($this->server('REQUEST_METHOD') == 'DELETE' ||
        	$this->server('HTTP_X_HTTP_METHOD_OVERRIDE') == 'DELETE') {
            $this->delete = file_get_contents('php://input');
            //parse and clean request
            $this->_parse_request($this->delete);
            
        } elseif ($this->server('REQUEST_METHOD') == 'PUT' ||
        		  $this->server('HTTP_X_HTTP_METHOD_OVERRIDE') == 'PUT' ) {
            $this->put = file_get_contents('php://input');
            //parse and clean request
            $this->_parse_request($this->put);
        } elseif ($this->server('REQUEST_METHOD') == 'POST' ||
        		  $this->server('HTTP_X_HTTP_METHOD_OVERRIDE') == 'POST' ) {
        	$this->post = file_get_contents('php://input');
            $this->_parse_request($this->post);
        }
    }
	// --------------------------------------------------------------------
     
	/**
	* Fetch an item from the POST JSON array
	*
	* @access	public
	* @param	string
	* @param	bool
	* @return	string
	*/
	function post_json($index = NULL, $xss_clean = FALSE)
	{
		// Check if a field has been provided
		if ($index === NULL AND ! empty($this->post) )
		{
			$post = array();

			// Loop through the full put array and return it
			foreach (array_keys($this->post) as $key)
			{
				$post[$key] = $this->_fetch_from_array($this->post, $key, $xss_clean);
			}
			return $post;
		}
		
		return $this->_fetch_from_array($this->post, $index, $xss_clean);
	}


	// --------------------------------------------------------------------


	/**
	* Fetch an item from the PUT array
	*
	* @access	public
	* @param	string
	* @param	bool
	* @return	string
	*/
	function put($index = NULL, $xss_clean = FALSE)
	{
		// Check if a field has been provided
		if ($index === NULL AND ! empty($this->put) )
		{
			$put = array();

			// Loop through the full put array and return it
			foreach (array_keys($this->put) as $key)
			{
				$put[$key] = $this->_fetch_from_array($this->put, $key, $xss_clean);
			}
			return $put;
		}

		return $this->_fetch_from_array($this->put, $index, $xss_clean);
	}


	// --------------------------------------------------------------------

	/**
	* Fetch an item from the DELETE array
	*
	* @access	public
	* @param	string
	* @param	bool
	* @return	string
	*/
	function delete($index = NULL, $xss_clean = FALSE)
	{
		// Check if a field has been provided
		if ($index === NULL AND ! empty($this->delete) )
		{
			$delete = array();

			// Loop through the full delete array and return it
			foreach (array_keys($this->delete) as $key)
			{
				$delete[$key] = $this->_fetch_from_array($this->delete, $key, $xss_clean);
			}
			return $delete;
		}

		return $this->_fetch_from_array($this->delete, $index, $xss_clean);
	}


	// --------------------------------------------------------------------

	/**
	* Extend Sanitize Data
	*
	* @access	private
	* @return	void
	*/
	private function _sanitize_request(&$data)
	{	
		//convert object to array
		$object = $data;
		$data = array();
		
		//clean put variables
		foreach( $object as $key => $val)
		{
                        if(!is_object ($val) )                
			     $data[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
		}
		
		log_message('debug', "Global PUT and DELETE data sanitized");
	}
	
	// --------------------------------------------------------------------

	/**
	* Parse json request
	*
	* @access	private
	* @return	void
	*/
	private function _parse_request(&$array)
	{
		//for now only json :(, will add more as they come up
		if( $this->server('CONTENT_TYPE') == "application/json" ||
		    $this->server('CONTENT_TYPE') == "application/json; charset=UTF-8") {
			$array = json_decode($array);
		}else{
			parse_str( $array, $array );
		}
		
		$this->_sanitize_request($array);
	}
	
	// --------------------------------------------------------------------

}
// END MY_Input Class

/* End of file MY_Input.php */
/* Location: ./application/core/MY_Input.php */
?>

Hi friends,
I can't get the $this->input->post() data; this show me empty array print_r($this->input->post());

Thank you!