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 <div class="section" id="input-class">
<h1>Input Class<a class="headerlink" href="#input-class" title="Permalink to this headline">¶</a></h1>
The Input Class serves two purposes:
<ol class="arabic simple">
<li>It pre-processes global input data for security.</li>
<li>It provides some helper methods for fetching input data and pre-processing it.</li>
</ol>
<div class="admonition note">
Note
This class is initialized automatically by the system so there
is no need to do it manually.
</div>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><a class="reference internal" href="#input-filtering" id="id1">Input Filtering</a><ul>
<li><a class="reference internal" href="#security-filtering" id="id2">Security Filtering</a></li>
<li><a class="reference internal" href="#xss-filtering" id="id3">XSS Filtering</a></li>
</ul>
</li>
<li><a class="reference internal" href="#accessing-form-data" id="id4">Accessing form data</a><ul>
<li><a class="reference internal" href="#using-post-get-cookie-or-server-data" id="id5">Using POST, GET, COOKIE, or SERVER Data</a></li>
<li><a class="reference internal" href="#using-the-php-input-stream" id="id6">Using the php://input stream</a></li>
</ul>
</li>
<li><a class="reference internal" href="#class-reference" id="id7">Class Reference</a></li>
</ul>
</div>
<div class="custom-index container"></div><div class="section" id="input-filtering">
<h2><a class="toc-backref" href="#id1">Input Filtering</a><a class="headerlink" href="#input-filtering" title="Permalink to this headline">¶</a></h2>
<div class="section" id="security-filtering">
<h3><a class="toc-backref" href="#id2">Security Filtering</a><a class="headerlink" href="#security-filtering" title="Permalink to this headline">¶</a></h3>
The security filtering method is called automatically when a new
<a class="reference internal" href="../general/controllers.html">controller</a> is invoked. It does the
following:
<ul class="simple">
<li>If <code class="docutils literal">$config['allow_get_array']</code> is FALSE (default is TRUE), destroys
the global GET array.</li>
<li>Destroys all global variables in the event register_globals is
turned on.</li>
<li>Filters the GET/POST/COOKIE array keys, permitting only alpha-numeric
(and a few other) characters.</li>
<li>Provides XSS (Cross-site Scripting Hacks) filtering. This can be
enabled globally, or upon request.</li>
<li>Standardizes newline characters to <code class="docutils literal">PHP_EOL</code> (\n in UNIX-based OSes,
\r\n under Windows). This is configurable.</li>
</ul>
</div>
<div class="section" id="xss-filtering">
<h3><a class="toc-backref" href="#id3">XSS Filtering</a><a class="headerlink" href="#xss-filtering" title="Permalink to this headline">¶</a></h3>
The Input class has the ability to filter input automatically to prevent
cross-site scripting attacks. If you want the filter to run
automatically every time it encounters POST or COOKIE data you can
enable it by opening your application/config/config.php file and setting
this:
<div class="highlight-ci"><div class="highlight"><pre>$config[&#39;global_xss_filtering&#39;] = TRUE;
</pre></div>
</div>
Please refer to the <a class="reference internal" href="security.html">Security class</a> documentation for
information on using XSS Filtering in your application.
<div class="admonition important">
Important
The ‘global_xss_filtering’ setting is DEPRECATED and kept
solely for backwards-compatibility purposes. XSS escaping should
be performed on output, not input!
</div>
</div>
</div>
<div class="section" id="accessing-form-data">
<h2><a class="toc-backref" href="#id4">Accessing form data</a><a class="headerlink" href="#accessing-form-data" title="Permalink to this headline">¶</a></h2>
<div class="section" id="using-post-get-cookie-or-server-data">
<h3><a class="toc-backref" href="#id5">Using POST, GET, COOKIE, or SERVER Data</a><a class="headerlink" href="#using-post-get-cookie-or-server-data" title="Permalink to this headline">¶</a></h3>
CodeIgniter comes with helper methods that let you fetch POST, GET,
COOKIE or SERVER items. The main advantage of using the provided
methods rather than fetching an item directly (<code class="docutils literal">$_POST['something']</code>)
is that the methods will check to see if the item is set and return
NULL if not. This lets you conveniently use data without
having to test whether an item exists first. In other words, normally
you might do something like this:
<div class="highlight-ci"><div class="highlight"><pre>$something = isset($_POST[&#39;something&#39;]) ? $_POST[&#39;something&#39;] : NULL;
</pre></div>
</div>
With CodeIgniter’s built in methods you can simply do this:
<div class="highlight-ci"><div class="highlight"><pre>$something = $this-&gt;input-&gt;post(&#39;something&#39;);
</pre></div>
</div>
The main methods are:
<ul class="simple">
<li><code class="docutils literal">$this-&gt;input-&gt;post()</code></li>
<li><code class="docutils literal">$this-&gt;input-&gt;get()</code></li>
<li><code class="docutils literal">$this-&gt;input-&gt;cookie()</code></li>
<li><code class="docutils literal">$this-&gt;input-&gt;server()</code></li>
</ul>
</div>
<div class="section" id="using-the-php-input-stream">
<h3><a class="toc-backref" href="#id6">Using the php://input stream</a><a class="headerlink" href="#using-the-php-input-stream" title="Permalink to this headline">¶</a></h3>
If you want to utilize the PUT, DELETE, PATCH or other exotic request
methods, they can only be accessed via a special input stream, that
can only be read once. This isn’t as easy as just reading from e.g.
the <code class="docutils literal">$_POST</code> array, because it will always exist and you can try
and access multiple variables without caring that you might only have
one shot at all of the POST data.
CodeIgniter will take care of that for you, and you can read the data
from the php://input stream at any time, just by using the
<code class="docutils literal">$raw_input_stream</code> property:
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;raw_input_stream;
</pre></div>
</div>
Additionally if the input stream is form-encoded like $_POST you can
access its values by calling the
<code class="docutils literal">input_stream()</code> method:
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;input_stream(&#39;key&#39;);
</pre></div>
</div>
Similar to other methods such as <code class="docutils literal">get()</code> and <code class="docutils literal">post()</code>, if the
requested data is not found, it will return NULL and you can also
decide whether to run the data through <code class="docutils literal">xss_clean()</code> by passing
a boolean value as the second parameter:
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;input_stream(&#39;key&#39;, TRUE); // XSS Clean
$this-&gt;input-&gt;input_stream(&#39;key&#39;, FALSE); // No XSS filter
</pre></div>
</div>
<div class="admonition note">
Note
You can utilize <code class="docutils literal">method()</code> in order to know if you’re reading
PUT, DELETE or PATCH data.
</div>
</div>
</div>
<div class="section" id="class-reference">
<h2><a class="toc-backref" href="#id7">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="CI_Input">
class <code class="descname">CI_Input</code><a class="headerlink" href="#CI_Input" title="Permalink to this definition">¶</a></dt>
<dd><dl class="attribute">
<dt>
<code class="descname">$raw_input_stream</code></dt>
<dd>Read only property that will return php://input data as is.
The property can be read multiple times.
</dd></dl>

<dl class="method">
<dt id="CI_Input::post">
<code class="descname">post</code>([$index = NULL[, $xss_clean = NULL]])<a class="headerlink" href="#CI_Input::post" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li>$index (mixed) – POST parameter name</li>
<li>$xss_clean (bool) – Whether to apply XSS filtering</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">$_POST if no parameters supplied, otherwise the POST value if found or NULL if not
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">mixed
</td>
</tr>
</tbody>
</table>
The first parameter will contain the name of the POST item you are
looking for:
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;post(&#39;some_data&#39;);
</pre></div>
</div>
The method returns NULL if the item you are attempting to retrieve
does not exist.
The second optional parameter lets you run the data through the XSS
filter. It’s enabled by setting the second parameter to boolean TRUE
or by setting your <code class="docutils literal">$config['global_xss_filtering']</code> to TRUE.
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;post(&#39;some_data&#39;, TRUE);
</pre></div>
</div>
To return an array of all POST items call without any parameters.
To return all POST items and pass them through the XSS filter set the
first parameter NULL while setting the second parameter to boolean TRUE.
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;post(NULL, TRUE); // returns all POST items with XSS filter
$this-&gt;input-&gt;post(NULL, FALSE); // returns all POST items without XSS filter
</pre></div>
</div>
To return an array of multiple POST parameters, pass all the required keys
as an array.
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;post(array(&#39;field1&#39;, &#39;field2&#39;));
</pre></div>
</div>
Same rule applied here, to retrieve the parameters with XSS filtering enabled, set the
second parameter to boolean TRUE.
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;post(array(&#39;field1&#39;, &#39;field2&#39;), TRUE);
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Input::get">
<code class="descname">get</code>([$index = NULL[, $xss_clean = NULL]])<a class="headerlink" href="#CI_Input::get" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li>$index (mixed) – GET parameter name</li>
<li>$xss_clean (bool) – Whether to apply XSS filtering</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">$_GET if no parameters supplied, otherwise the GET value if found or NULL if not
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">mixed
</td>
</tr>
</tbody>
</table>
This method is identical to <code class="docutils literal">post()</code>, only it fetches GET data.
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;get(&#39;some_data&#39;, TRUE);
</pre></div>
</div>
To return an array of all GET items call without any parameters.
To return all GET items and pass them through the XSS filter set the
first parameter NULL while setting the second parameter to boolean TRUE.
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;get(NULL, TRUE); // returns all GET items with XSS filter
$this-&gt;input-&gt;get(NULL, FALSE); // returns all GET items without XSS filtering
</pre></div>
</div>
To return an array of multiple GET parameters, pass all the required keys
as an array.
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;get(array(&#39;field1&#39;, &#39;field2&#39;));
</pre></div>
</div>
Same rule applied here, to retrieve the parameters with XSS filtering enabled, set the
second parameter to boolean TRUE.
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;get(array(&#39;field1&#39;, &#39;field2&#39;), TRUE);
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Input::post_get">
<code class="descname">post_get</code>($index[, $xss_clean = NULL])<a class="headerlink" href="#CI_Input::post_get" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li>$index (string) – POST/GET parameter name</li>
<li>$xss_clean (bool) – Whether to apply XSS filtering</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">POST/GET value if found, NULL if not
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">mixed
</td>
</tr>
</tbody>
</table>
This method works pretty much the same way as <code class="docutils literal">post()</code> and <code class="docutils literal">get()</code>,
only combined. It will search through both POST and GET streams for data,
looking in POST first, and then in GET:
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;post_get(&#39;some_data&#39;, TRUE);
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Input::get_post">
<code class="descname">get_post</code>($index[, $xss_clean = NULL])<a class="headerlink" href="#CI_Input::get_post" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li>$index (string) – GET/POST parameter name</li>
<li>$xss_clean (bool) – Whether to apply XSS filtering</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">GET/POST value if found, NULL if not
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">mixed
</td>
</tr>
</tbody>
</table>
This method works the same way as <code class="docutils literal">post_get()</code> only it looks for GET
data first.
<blockquote>
<div>$this-&gt;input-&gt;get_post(‘some_data’, TRUE);</div></blockquote>
<div class="admonition note">
Note
This method used to act EXACTLY like <code class="docutils literal">post_get()</code>, but it’s
behavior has changed in CodeIgniter 3.0.
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Input::cookie">
<code class="descname">cookie</code>([$index = NULL[, $xss_clean = NULL]])<a class="headerlink" href="#CI_Input::cookie" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li>$index (mixed) – COOKIE name</li>
<li>$xss_clean (bool) – Whether to apply XSS filtering</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">$_COOKIE if no parameters supplied, otherwise the COOKIE value if found or NULL if not
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">mixed
</td>
</tr>
</tbody>
</table>
This method is identical to <code class="docutils literal">post()</code> and <code class="docutils literal">get()</code>, only it fetches cookie
data:
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;cookie(&#39;some_cookie&#39;);
$this-&gt;input-&gt;cookie(&#39;some_cookie&#39;, TRUE); // with XSS filter
</pre></div>
</div>
To return an array of multiple cookie values, pass all the required keys
as an array.
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;cookie(array(&#39;some_cookie&#39;, &#39;some_cookie2&#39;));
</pre></div>
</div>
<div class="admonition note">
Note
Unlike the <a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a>
function <a class="reference internal" href="../helpers/cookie_helper.html#get_cookie" title="get_cookie"><code class="xref php php-func docutils literal">get_cookie()</code></a>, this method does NOT prepend
your configured <code class="docutils literal">$config['cookie_prefix']</code> value.
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Input::server">
<code class="descname">server</code>($index[, $xss_clean = NULL])<a class="headerlink" href="#CI_Input::server" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li>$index (mixed) – Value name</li>
<li>$xss_clean (bool) – Whether to apply XSS filtering</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">$_SERVER item value if found, NULL if not
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">mixed
</td>
</tr>
</tbody>
</table>
This method is identical to the <code class="docutils literal">post()</code>, <code class="docutils literal">get()</code> and <code class="docutils literal">cookie()</code>
methods, only it fetches server data (<code class="docutils literal">$_SERVER</code>):
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;server(&#39;some_data&#39;);
</pre></div>
</div>
To return an array of multiple <code class="docutils literal">$_SERVER</code> values, pass all the required keys
as an array.
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;server(array(&#39;SERVER_PROTOCOL&#39;, &#39;REQUEST_URI&#39;));
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Input::input_stream">
<code class="descname">input_stream</code>([$index = NULL[, $xss_clean = NULL]])<a class="headerlink" href="#CI_Input::input_stream" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li>$index (mixed) – Key name</li>
<li>$xss_clean (bool) – Whether to apply XSS filtering</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">Input stream array if no parameters supplied, otherwise the specified value if found or NULL if not
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">mixed
</td>
</tr>
</tbody>
</table>
This method is identical to <code class="docutils literal">get()</code>, <code class="docutils literal">post()</code> and <code class="docutils literal">cookie()</code>,
only it fetches the php://input stream data.
</dd></dl>

<dl class="method">
<dt id="CI_Input::set_cookie">
<code class="descname">set_cookie</code>($name = ''[, $value = ''[, $expire = ''[, $domain = ''[, $path = '/'[, $prefix = ''[, $secure = NULL[, $httponly = NULL]]]]]]])<a class="headerlink" href="#CI_Input::set_cookie" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li>$name (mixed) – Cookie name or an array of parameters</li>
<li>$value (string) – Cookie value</li>
<li>$expire (int) – Cookie expiration time in seconds</li>
<li>$domain (string) – Cookie domain</li>
<li>$path (string) – Cookie path</li>
<li>$prefix (string) – Cookie name prefix</li>
<li>$secure (bool) – Whether to only transfer the cookie through HTTPS</li>
<li>$httponly (bool) – Whether to only make the cookie accessible for HTTP requests (no JavaScript)</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">void
</td>
</tr>
</tbody>
</table>
Sets a cookie containing the values you specify. There are two ways to
pass information to this method so that a cookie can be set: Array
Method, and Discrete Parameters:
Array Method
Using this method, an associative array is passed to the first
parameter:
<div class="highlight-ci"><div class="highlight"><pre>$cookie = array(
 &#39;name&#39; =&gt; &#39;The Cookie Name&#39;,
 &#39;value&#39; =&gt; &#39;The Value&#39;,
 &#39;expire&#39; =&gt; &#39;86500&#39;,
 &#39;domain&#39; =&gt; &#39;.some-domain.com&#39;,
 &#39;path&#39; =&gt; &#39;/&#39;,
 &#39;prefix&#39; =&gt; &#39;myprefix_&#39;,
 &#39;secure&#39; =&gt; TRUE
);

$this-&gt;input-&gt;set_cookie($cookie);
</pre></div>
</div>
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 method 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 httponly and secure flags, when omitted, will default to your
<code class="docutils literal">$config['cookie_httponly']</code> and <code class="docutils literal">$config['cookie_secure']</code> settings.
Discrete Parameters
If you prefer, you can set the cookie by passing data using individual
parameters:
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;set_cookie($name, $value, $expire, $domain, $path, $prefix, $secure);
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Input::ip_address">
<code class="descname">ip_address</code>()<a class="headerlink" href="#CI_Input::ip_address" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Visitor’s IP address or ‘0.0.0.0’ if not valid</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
</tr>
</tbody>
</table>
Returns the IP address for the current user. If the IP address is not
valid, the method will return ‘0.0.0.0’:
<div class="highlight-ci"><div class="highlight"><pre>echo $this-&gt;input-&gt;ip_address();
</pre></div>
</div>
<div class="admonition important">
Important
This method takes into account the <code class="docutils literal">$config['proxy_ips']</code>
setting and will return the reported HTTP_X_FORWARDED_FOR,
HTTP_CLIENT_IP, HTTP_X_CLIENT_IP or HTTP_X_CLUSTER_CLIENT_IP
address for the allowed IP addresses.
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Input::valid_ip">
<code class="descname">valid_ip</code>($ip[, $which = ''])<a class="headerlink" href="#CI_Input::valid_ip" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li>$ip (string) – IP address</li>
<li>$which (string) – IP protocol (‘ipv4’ or ‘ipv6’)</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">TRUE if the address is valid, FALSE if not
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">bool
</td>
</tr>
</tbody>
</table>
Takes an IP address as input and returns TRUE or FALSE (boolean) depending
on whether it is valid or not.
<div class="admonition note">
Note
The $this-&gt;input-&gt;ip_address() method above automatically
validates the IP address.
</div>
<div class="highlight-ci"><div class="highlight"><pre>if ( ! $this-&gt;input-&gt;valid_ip($ip))
{
 echo &#39;Not Valid&#39;;
}
else
{
 echo &#39;Valid&#39;;
}
</pre></div>
</div>
Accepts an optional second string parameter of ‘ipv4’ or ‘ipv6’ to specify
an IP format. The default checks for both formats.
</dd></dl>

<dl class="method">
<dt id="CI_Input::user_agent">
<code class="descname">user_agent</code>([$xss_clean = NULL])<a class="headerlink" href="#CI_Input::user_agent" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">User agent string or NULL if not set
</td>
</tr>
<tr class="field-even field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li>$xss_clean (bool) – Whether to apply XSS filtering</li>
</ul>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">mixed
</td>
</tr>
</tbody>
</table>
Returns the user agent string (web browser) being used by the current user,
or NULL if it’s not available.
<div class="highlight-ci"><div class="highlight"><pre>echo $this-&gt;input-&gt;user_agent();
</pre></div>
</div>
See the <a class="reference internal" href="user_agent.html">User Agent Class</a> for methods which extract
information from the user agent string.
</dd></dl>

<dl class="method">
<dt id="CI_Input::request_headers">
<code class="descname">request_headers</code>([$xss_clean = FALSE])<a class="headerlink" href="#CI_Input::request_headers" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li>$xss_clean (bool) – Whether to apply XSS filtering</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">An array of HTTP request headers
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">array
</td>
</tr>
</tbody>
</table>
Returns an array of HTTP request headers.
Useful if running in a non-Apache environment where
<a class="reference external" href="http://php.net/apache_request_headers">apache_request_headers()</a>
will not be supported.
<div class="highlight-ci"><div class="highlight"><pre>$headers = $this-&gt;input-&gt;request_headers();
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Input::get_request_header">
<code class="descname">get_request_header</code>($index[, $xss_clean = FALSE])<a class="headerlink" href="#CI_Input::get_request_header" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li>$index (string) – HTTP request header name</li>
<li>$xss_clean (bool) – Whether to apply XSS filtering</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">An HTTP request header or NULL if not found
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">string
</td>
</tr>
</tbody>
</table>
Returns a single member of the request headers array or NULL
if the searched header is not found.
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;get_request_header(&#39;some-header&#39;, TRUE);
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Input::is_ajax_request">
<code class="descname">is_ajax_request</code>()<a class="headerlink" href="#CI_Input::is_ajax_request" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE if it is an Ajax request, FALSE if not</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
</tr>
</tbody>
</table>
Checks to see if the HTTP_X_REQUESTED_WITH server header has been
set, and returns boolean TRUE if it is or FALSE if not.
</dd></dl>

<dl class="method">
<dt id="CI_Input::is_cli_request">
<code class="descname">is_cli_request</code>()<a class="headerlink" href="#CI_Input::is_cli_request" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE if it is a CLI request, FALSE if not</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
</tr>
</tbody>
</table>
Checks to see if the application was run from the command-line
interface.
<div class="admonition note">
Note
This method checks both the PHP SAPI name currently in use
and if the <code class="docutils literal">STDIN</code> constant is defined, which is usually a
failsafe way to see if PHP is being run via the command line.
</div>
<div class="highlight-ci"><div class="highlight"><pre>$this-&gt;input-&gt;is_cli_request()
</pre></div>
</div>
<div class="admonition note">
Note
This method is DEPRECATED and is now just an alias for the
<code class="xref py py-func docutils literal">is_cli()</code> function.
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Input::method">
<code class="descname">method</code>([$upper = FALSE])<a class="headerlink" href="#CI_Input::method" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li>$upper (bool) – Whether to return the request method name in upper or lower case</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">HTTP request method
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">string
</td>
</tr>
</tbody>
</table>
Returns the <code class="docutils literal">$_SERVER['REQUEST_METHOD']</code>, with the option to set it
in uppercase or lowercase.
<div class="highlight-ci"><div class="highlight"><pre>echo $this-&gt;input-&gt;method(TRUE); // Outputs: POST
echo $this-&gt;input-&gt;method(FALSE); // Outputs: post
echo $this-&gt;input-&gt;method(); // Outputs: post
</pre></div>
</div>
</dd></dl>

</dd></dl>

</div>
</div>

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