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-<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
-<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
-Security Helper
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-<h1>Security Helper</h1>
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-<p>The Security Helper file contains security related functions.</p>
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-<h2>Loading this Helper</h2>
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-<p>This helper is loaded using the following code:</p>
-<code>$this->load->helper('security');</code>
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-<p>The following functions are available:</p>
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-<h2>xss_clean()</h2>
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-<p>Provides Cross Site Script Hack filtering. This function is an alias to the one in the
-<a href="../libraries/input.html">Input class</a>. More info can be found there.</p>
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-<h2>sanitize_filename()</h2>
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-<p>Provides protection against directory traversal. This function is an alias to the one in the
-<a href="../libraries/security.html">Security class</a>. More info can be found there.</p>
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-<h2>do_hash()</h2>
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-<p>Permits you to create SHA1 or MD5 one way hashes suitable for encrypting passwords. Will create SHA1 by default. Examples:</p>
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-<code>
-$str = do_hash($str); // SHA1<br />
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-$str = do_hash($str, 'md5'); // MD5
-</code>
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-<p class="important"><strong>Note:</strong> This function was formerly named <kbd>dohash()</kbd>, which has been deprecated in favour of <kbd>do_hash()</kbd>.</p>
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-<h2>strip_image_tags()</h2>
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-<p>This is a security function that will strip image tags from a string. It leaves the image URL as plain text.</p>
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-<code>$string = strip_image_tags($string);</code>
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-<h2>encode_php_tags()</h2>
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-<p>This is a security function that converts PHP tags to entities. Note: If you use the XSS filtering function it does this automatically.</p>
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-<code>$string = encode_php_tags($string);</code>
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