td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>Returns the user agent string (web browser) being used by the current user,
or NULL if it’s not available.</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">input</span><span class="o">-&gt;</span><span class="na">user_agent</span><span class="p">();</span>
</pre></div>
</div>
<p>See the <a class="r