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###############
Security Helper
###############
The Security Helper file contains security related functions.
.. contents:: Page Contents
Loading this Helper
===================
This helper is loaded using the following code::
$this->load->helper('security');
The following functions are available:
xss_clean()
===========
.. php:function:: xss_clean($str, $is_image = FALSE)
:param string $str: Input data
:param bool $is_image: Whether we're dealing with an image
:returns: string
Provides Cross Site Script Hack filtering.
This function is an alias for ``CI_Input::xss_clean()``. For more info,
please see the :doc:`Input Library <../libraries/input>` documentation.
sanitize_filename()
===================
.. php:function:: sanitize_filename($filename)
:param string $filename: Filename
:returns: string
Provides protection against directory traversal.
This function is an alias for ``CI_Security::sanitize_filename()``.
For more info, please see the :doc:`Security Library <../libraries/security>`
documentation.
do_hash()
=========
.. php:function:: do_hash($str, $type = 'sha1')
:param string $str: Input
:param string $type: Algorithm
:returns: string
Permits you to create one way hashes suitable for encrypting
passwords. Will use SHA1 by default.
See `hash_algos() <http://php.net/function.hash_algos>`_
for a full list of supported algorithms.
Examples::
$str = do_hash($str); // SHA1
$str = do_hash($str, 'md5'); // MD5
.. note:: This function was formerly named ``dohash()``, which has been
removed in favor of ``do_hash()``.
.. note:: This function is DEPRECATED. Use the native ``hash()`` instead.
strip_image_tags()
==================
.. php:function:: strip_image_tags($str)
:param string $str: Input
:returns: string
This is a security function that will strip image tags from a string.
It leaves the image URL as plain text.
Example::
$string = strip_image_tags($string);
This function is an alias for ``CI_Security::strip_image_tags()``. For
more info, please see the :doc:`Security Library <../libraries/security>`
documentation.
encode_php_tags()
=================
.. php:function:: encode_php_tags($str)
:param string $str: Input
:returns: string
This is a security function that converts PHP tags to entities.
.. note: :php:func:`xss_clean()` does this automatically, if you use it.
Example::
$string = encode_php_tags($string);
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