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+###########
+Input Class
+###########
+
+The Input Class serves two purposes:
+
+#. It pre-processes global input data for security.
+#. It provides some helper functions for fetching input data and
+   pre-processing it.
+
+.. note:: This class is initialized automatically by the system so there
+	is no need to do it manually.
+
+Security Filtering
+==================
+
+The security filtering function is called automatically when a new
+:doc:`controller <../general/controllers>` is invoked. It does the
+following:
+
+-  If $config['allow_get_array'] is FALSE(default is TRUE), destroys
+   the global GET array.
+-  Destroys all global variables in the event register_globals is
+   turned on.
+-  Filters the GET/POST/COOKIE array keys, permitting only alpha-numeric
+   (and a few other) characters.
+-  Provides XSS (Cross-site Scripting Hacks) filtering. This can be
+   enabled globally, or upon request.
+-  Standardizes newline characters to \\n(In Windows \\r\\n)
+
+XSS Filtering
+=============
+
+The Input class has the ability to filter input automatically to prevent
+cross-site scripting attacks. If you want the filter to run
+automatically every time it encounters POST or COOKIE data you can
+enable it by opening your application/config/config.php file and setting
+this::
+
+	$config['global_xss_filtering'] = TRUE;
+
+Please refer to the :doc:`Security class <security>` documentation for
+information on using XSS Filtering in your application.
+
+Using POST, COOKIE, or SERVER Data
+==================================
+
+CodeIgniter comes with three helper functions that let you fetch POST,
+COOKIE or SERVER items. The main advantage of using the provided
+functions rather than fetching an item directly ($_POST['something'])
+is that the functions will check to see if the item is set and return
+false (boolean) if not. This lets you conveniently use data without
+having to test whether an item exists first. In other words, normally
+you might do something like this::
+
+	 if ( ! isset($_POST['something'])) {     $something = FALSE; } else {     $something = $_POST['something']; }
+
+With CodeIgniter's built in functions you can simply do this::
+
+	$something = $this->input->post('something');
+
+The three functions are:
+
+-  $this->input->post()
+-  $this->input->cookie()
+-  $this->input->server()
+
+$this->input->post()
+====================
+
+The first parameter will contain the name of the POST item you are
+looking for::
+
+	$this->input->post('some_data');
+
+The function returns FALSE (boolean) if the item you are attempting to
+retrieve does not exist.
+
+The second optional parameter lets you run the data through the XSS
+filter. It's enabled by setting the second parameter to boolean TRUE;
+
+::
+
+	$this->input->post('some_data', TRUE);
+
+To return an array of all POST items call without any parameters.
+
+To return all POST items and pass them through the XSS filter set the
+first parameter NULL while setting the second parameter to boolean;
+
+The function returns FALSE (boolean) if there are no items in the POST.
+
+::
+
+	     $this->input->post(NULL, TRUE); // returns all POST items with XSS filter          $this->input->post(); // returns all POST items without XSS filter
+
+$this->input->get()
+===================
+
+This function is identical to the post function, only it fetches get
+data::
+
+	$this->input->get('some_data', TRUE);
+
+To return an array of all GET items call without any parameters.
+
+To return all GET items and pass them through the XSS filter set the
+first parameter NULL while setting the second parameter to boolean;
+
+The function returns FALSE (boolean) if there are no items in the GET.
+
+::
+
+	     $this->input->get(NULL, TRUE); // returns all GET items with XSS filter          $this->input->get(); // returns all GET items without XSS filtering
+
+$this->input->get_post()
+=========================
+
+This function will search through both the post and get streams for
+data, looking first in post, and then in get::
+
+	$this->input->get_post('some_data', TRUE);
+
+$this->input->cookie()
+======================
+
+This function is identical to the post function, only it fetches cookie
+data::
+
+	$this->input->cookie('some_data', TRUE);
+
+$this->input->server()
+======================
+
+This function is identical to the above functions, only it fetches
+server data::
+
+	$this->input->server('some_data');
+
+$this->input->set_cookie()
+===========================
+
+Sets a cookie containing the values you specify. There are two ways to
+pass information to this function so that a cookie can be set: Array
+Method, and Discrete Parameters:
+
+Array Method
+^^^^^^^^^^^^
+
+Using this method, an associative array is passed to the first
+parameter::
+
+	$cookie = array(     'name'   => 'The Cookie Name',     'value'  => 'The Value',     'expire' => '86500',     'domain' => '.some-domain.com',     'path'   => '/',     'prefix' => 'myprefix_',     'secure' => TRUE );  $this->input->set_cookie($cookie);
+
+**Notes:**
+
+Only the name and value are required. To delete a cookie set it with the
+expiration blank.
+
+The expiration is set in **seconds**, which will be added to the current
+time. Do not include the time, but rather only the number of seconds
+from *now* that you wish the cookie to be valid. If the expiration is
+set to zero the cookie will only last as long as the browser is open.
+
+For site-wide cookies regardless of how your site is requested, add your
+URL to the **domain** starting with a period, like this:
+.your-domain.com
+
+The path is usually not needed since the function sets a root path.
+
+The prefix is only needed if you need to avoid name collisions with
+other identically named cookies for your server.
+
+The secure boolean is only needed if you want to make it a secure cookie
+by setting it to TRUE.
+
+Discrete Parameters
+^^^^^^^^^^^^^^^^^^^
+
+If you prefer, you can set the cookie by passing data using individual
+parameters::
+
+	$this->input->set_cookie($name, $value, $expire, $domain, $path, $prefix, $secure);
+
+$this->input->cookie()
+======================
+
+Lets you fetch a cookie. The first parameter will contain the name of
+the cookie you are looking for (including any prefixes)::
+
+	cookie('some_cookie');
+
+The function returns FALSE (boolean) if the item you are attempting to
+retrieve does not exist.
+
+The second optional parameter lets you run the data through the XSS
+filter. It's enabled by setting the second parameter to boolean TRUE;
+
+::
+
+	cookie('some_cookie', TRUE);
+
+
+$this->input->ip_address()
+===========================
+
+Returns the IP address for the current user. If the IP address is not
+valid, the function will return an IP of: 0.0.0.0
+
+::
+
+	echo $this->input->ip_address();
+
+$this->input->valid_ip($ip)
+============================
+
+Takes an IP address as input and returns TRUE or FALSE (boolean) if it
+is valid or not. Note: The $this->input->ip_address() function above
+validates the IP automatically.
+
+::
+
+	if ( ! $this->input->valid_ip($ip)) {      echo 'Not Valid'; } else {      echo 'Valid'; }
+
+$this->input->user_agent()
+===========================
+
+Returns the user agent (web browser) being used by the current user.
+Returns FALSE if it's not available.
+
+::
+
+	echo $this->input->user_agent();
+
+See the :doc:`User Agent Class <user_agent>` for methods which extract
+information from the user agent string.
+
+$this->input->request_headers()
+================================
+
+Useful if running in a non-Apache environment where
+`apache_request_headers() <http://php.net/apache_request_headers>`_
+will not be supported. Returns an array of headers.
+
+::
+
+	$headers = $this->input->request_headers();
+
+$this->input->get_request_header();
+=====================================
+
+Returns a single member of the request headers array.
+
+::
+
+	$this->input->get_request_header('some-header', TRUE);
+
+$this->input->is_ajax_request()
+=================================
+
+Checks to see if the HTTP_X_REQUESTED_WITH server header has been
+set, and returns a boolean response.
+
+$this->input->is_cli_request()
+================================
+
+Checks to see if the STDIN constant is set, which is a failsafe way to
+see if PHP is being run on the command line.
+
+::
+
+	$this->input->is_cli_request()
+