Practice/wheeparam/application/core/WB_Input.php

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

class WB_Input extends CI_Input
{

    /**
     * Fetch from array
     *
     * Internal method used to retrieve values from global arrays.
     *
     * @param	array	&$array		$_GET, $_POST, $_COOKIE, $_SERVER, etc.
     * @param	mixed	$index		Index for item to be fetched from $array
     * @param	bool	$xss_clean	Whether to apply XSS filtering
     * @return	mixed
     */
    protected function _fetch_from_array(&$array, $index = NULL, $xss_clean = NULL, $default_value =NULL)
    {
        is_bool($xss_clean) OR $xss_clean = $this->_enable_xss;

        // If $index is NULL, it means that the whole $array is requested
        isset($index) OR $index = array_keys($array);

        // allow fetching multiple keys at once
        if (is_array($index))
        {
            $output = array();
            foreach ($index as $key)
            {
                $output[$key] = $this->_fetch_from_array($array, $key, $xss_clean);
            }

            return $output;
        }

        if (isset($array[$index]))
        {
            $value = $array[$index];
        }
        elseif (($count = preg_match_all('/(?:^[^\[]+)|\[[^]]*\]/', $index, $matches)) > 1) // Does the index contain array notation
        {
            $value = $array;
            for ($i = 0; $i < $count; $i++)
            {
                $key = trim($matches[0][$i], '[]');
                if ($key === '') // Empty notation will return the value as array
                {
                    break;
                }

                if (isset($value[$key]))
                {
                    $value = $value[$key];
                }
                else
                {
                    return $default_value;
                }
            }
        }
        else
        {
            return $default_value;
        }

        return ($xss_clean === TRUE)
            ? $this->security->xss_clean($value)
            : $value;
    }

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

    /**
     * Fetch an item from the GET array
     *
     * @param	mixed	$index		Index for item to be fetched from $_GET
     * @param	bool	$xss_clean	Whether to apply XSS filtering
     * @return	mixed
     */
    public function get($index = NULL, $xss_clean = NULL, $default_value = NULL)
    {
        return $this->_fetch_from_array($_GET, $index, $xss_clean, $default_value);
    }

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

    /**
     * Fetch an item from the POST array
     *
     * @param	mixed	$index		Index for item to be fetched from $_POST
     * @param	bool	$xss_clean	Whether to apply XSS filtering
     * @return	mixed
     */
    public function post($index = NULL, $xss_clean = NULL, $default_value = NULL)
    {
        return $this->_fetch_from_array($_POST, $index, $xss_clean, $default_value);
    }

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

    /**
     * Fetch an item from POST data with fallback to GET
     *
     * @param	string	$index		Index for item to be fetched from $_POST or $_GET
     * @param	bool	$xss_clean	Whether to apply XSS filtering
     * @return	mixed
     */
    public function post_get($index, $xss_clean = NULL, $default_value = NULL)
    {
        return isset($_POST[$index])
            ? $this->post($index, $xss_clean, $default_value)
            : $this->get($index, $xss_clean, $default_value);
    }

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

    /**
     * Fetch an item from GET data with fallback to POST
     *
     * @param	string	$index		Index for item to be fetched from $_GET or $_POST
     * @param	bool	$xss_clean	Whether to apply XSS filtering
     * @return	mixed
     */
    public function get_post($index, $xss_clean = NULL, $default_value = NULL)
    {
        return isset($_GET[$index])
            ? $this->get($index, $xss_clean, $default_value)
            : $this->post($index, $xss_clean, $default_value);
    }

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

    /**
     * Fetch an item from the COOKIE array
     *
     * @param	mixed	$index		Index for item to be fetched from $_COOKIE
     * @param	bool	$xss_clean	Whether to apply XSS filtering
     * @return	mixed
     */
    public function cookie($index = NULL, $xss_clean = NULL, $default_value = NULL)
    {
        return $this->_fetch_from_array($_COOKIE, $index, $xss_clean, $default_value);
    }

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

    /**
     * Fetch an item from the SERVER array
     *
     * @param	mixed	$index		Index for item to be fetched from $_SERVER
     * @param	bool	$xss_clean	Whether to apply XSS filtering
     * @return	mixed
     */
    public function server($index, $xss_clean = NULL, $default_value = NULL)
    {
        return $this->_fetch_from_array($_SERVER, $index, $xss_clean, $default_value);
    }

}