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<div class="section" id="user-agent-class">
<h1>User Agent Class<a class="headerlink" href="#user-agent-class" title="Permalink to this headline">¶</a></h1>
<p>The User Agent Class provides functions that help identify information
about the browser, mobile device, or robot visiting your site. In
addition you can get referrer information as well as language and
supported character-set information.</p>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><a class="reference internal" href="#using-the-user-agent-class" id="id1">Using the User Agent Class</a><ul>
<li><a class="reference internal" href="#initializing-the-class" id="id2">Initializing the Class</a></li>
<li><a class="reference internal" href="#user-agent-definitions" id="id3">User Agent Definitions</a></li>
<li><a class="reference internal" href="#example" id="id4">Example</a></li>
</ul>
</li>
<li><a class="reference internal" href="#class-reference" id="id5">Class Reference</a></li>
</ul>
</div>
<div class="custom-index container"></div><div class="section" id="using-the-user-agent-class">
<h2><a class="toc-backref" href="#id1">Using the User Agent Class</a><a class="headerlink" href="#using-the-user-agent-class" title="Permalink to this headline">¶</a></h2>
<div class="section" id="initializing-the-class">
<h3><a class="toc-backref" href="#id2">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h3>
<p>Like most other classes in CodeIgniter, the User Agent class is
initialized in your controller using the $this->load->library function:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'user_agent'</span><span class="p">);</span>
</pre></div>
</div>
<p>Once loaded, the object will be available using: <tt class="docutils literal"><span class="pre">$this->agent</span></tt></p>
</div>
<div class="section" id="user-agent-definitions">
<h3><a class="toc-backref" href="#id3">User Agent Definitions</a><a class="headerlink" href="#user-agent-definitions" title="Permalink to this headline">¶</a></h3>
<p>The user agent name definitions are located in a config file located at:
application/config/user_agents.php. You may add items to the various
user agent arrays if needed.</p>
</div>
<div class="section" id="example">
<h3><a class="toc-backref" href="#id4">Example</a><a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h3>
<p>When the User Agent class is initialized it will attempt to determine
whether the user agent browsing your site is a web browser, a mobile
device, or a robot. It will also gather the platform information if it
is available.</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'user_agent'</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">is_browser</span><span class="p">())</span>
<span class="p">{</span>
<span class="nv">$agent</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">browser</span><span class="p">()</span><span class="o">.</span><span class="s1">' '</span><span class="o">.</span><span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">version</span><span class="p">();</span>
<span class="p">}</span>
<span class="k">elseif</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">is_robot</span><span class="p">())</span>
<span class="p">{</span>
<span class="nv">$agent</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">robot</span><span class="p">();</span>
<span class="p">}</span>
<span class="k">elseif</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">is_mobile</span><span class="p">())</span>
<span class="p">{</span>
<span class="nv">$agent</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">mobile</span><span class="p">();</span>
<span class="p">}</span>
<span class="k">else</span>
<span class="p">{</span>
<span class="nv">$agent</span> <span class="o">=</span> <span class="s1">'Unidentified User Agent'</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">echo</span> <span class="nv">$agent</span><span class="p">;</span>
<span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">platform</span><span class="p">();</span> <span class="c1">// Platform info (Windows, Linux, Mac, etc.)</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="class-reference">
<h2><a class="toc-backref" href="#id5">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="CI_User_agent">
<em class="property">class </em><tt class="descname">CI_User_agent</tt><a class="headerlink" href="#CI_User_agent" title="Permalink to this definition">¶</a></dt>
<dd><dl class="method">
<dt id="CI_User_agent::is_browser">
<tt class="descname">is_browser</tt><big>(</big><span class="optional">[</span><em>$key = NULL</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_User_agent::is_browser" 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><strong>$key</strong> (<em>string</em>) – Optional browser name</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the user agent is a (specified) browser, FALSE if not</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
</td>
</tr>
</tbody>
</table>
<p>Returns TRUE/FALSE (boolean) if the user agent is a known web browser.</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">is_browser</span><span class="p">(</span><span class="s1">'Safari'</span><span class="p">))</span>
<span class="p">{</span>
<span class="k">echo</span> <span class="s1">'You are using Safari.'</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">elseif</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">is_browser</span><span class="p">())</span>
<span class="p">{</span>
<span class="k">echo</span> <span class="s1">'You are using a browser.'</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The string “Safari” in this example is an array key in the list of browser definitions.
You can find this list in <strong>application/config/user_agents.php</strong> if you want to add new
browsers or change the stings.</p>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::is_mobile">
<tt class="descname">is_mobile</tt><big>(</big><span class="optional">[</span><em>$key = NULL</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_User_agent::is_mobile" 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><strong>$key</strong> (<em>string</em>) – Optional mobile device name</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the user agent is a (specified) mobile device, FALSE if not</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
</td>
</tr>
</tbody>
</table>
<p>Returns TRUE/FALSE (boolean) if the user agent is a known mobile device.</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">is_mobile</span><span class="p">(</span><span class="s1">'iphone'</span><span class="p">))</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">view</span><span class="p">(</span><span class="s1">'iphone/home'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">elseif</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">is_mobile</span><span class="p">())</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">view</span><span class="p">(</span><span class="s1">'mobile/home'</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">else</span>
<span class="p">{</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">view</span><span class="p">(</span><span class="s1">'web/home'</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::is_robot">
<tt class="descname">is_robot</tt><big>(</big><span class="optional">[</span><em>$key = NULL</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_User_agent::is_robot" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$key</strong> (<em>string</em>) – Optional robot name</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the user agent is a (specified) robot, FALSE if not</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
</td>
</tr>
</tbody>
</table>
<p>Returns TRUE/FALSE (boolean) if the user agent is a known robot.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The user agent library only contains the most common robot definitions. It is not a complete list of bots.
There are hundreds of them so searching for each one would not be very efficient. If you find that some bots
that commonly visit your site are missing from the list you can add them to your
<strong>application/config/user_agents.php</strong> file.</p>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::is_referral">
<tt class="descname">is_referral</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_User_agent::is_referral" 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 the user agent is a referral, 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>
<p>Returns TRUE/FALSE (boolean) if the user agent was referred from another site.</p>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::browser">
<tt class="descname">browser</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_User_agent::browser" 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">Detected browser or an empty string</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
</tr>
</tbody>
</table>
<p>Returns a string containing the name of the web browser viewing your site.</p>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::version">
<tt class="descname">version</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_User_agent::version" 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">Detected browser version or an empty string</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
</tr>
</tbody>
</table>
<p>Returns a string containing the version number of the web browser viewing your site.</p>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::mobile">
<tt class="descname">mobile</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_User_agent::mobile" 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">Detected mobile device brand or an empty string</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
</tr>
</tbody>
</table>
<p>Returns a string containing the name of the mobile device viewing your site.</p>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::robot">
<tt class="descname">robot</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_User_agent::robot" 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">Detected robot name or an empty string</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
</tr>
</tbody>
</table>
<p>Returns a string containing the name of the robot viewing your site.</p>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::platform">
<tt class="descname">platform</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_User_agent::platform" 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">Detected operating system or an empty string</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
</tr>
</tbody>
</table>
<p>Returns a string containing the platform viewing your site (Linux, Windows, OS X, etc.).</p>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::referrer">
<tt class="descname">referrer</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_User_agent::referrer" 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">Detected referrer or an empty string</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
</tr>
</tbody>
</table>
<p>The referrer, if the user agent was referred from another site. Typically you’ll test for this as follows:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">is_referral</span><span class="p">())</span>
<span class="p">{</span>
<span class="k">echo</span> <span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">referrer</span><span class="p">();</span>
<span class="p">}</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::agent_string">
<tt class="descname">agent_string</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_User_agent::agent_string" 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">Full user agent string or an empty string</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
</tr>
</tbody>
</table>
<p>Returns a string containing the full user agent string. Typically it will be something like this:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">Mozilla</span><span class="o">/</span><span class="mf">5.0</span> <span class="p">(</span><span class="nx">Macintosh</span><span class="p">;</span> <span class="nx">U</span><span class="p">;</span> <span class="nx">Intel</span> <span class="nx">Mac</span> <span class="nx">OS</span> <span class="nx">X</span><span class="p">;</span> <span class="nx">en</span><span class="o">-</span><span class="nx">US</span><span class="p">;</span> <span class="nx">rv</span><span class="o">:</span><span class="mf">1.8</span><span class="o">.</span><span class="mf">0.4</span><span class="p">)</span> <span class="nx">Gecko</span><span class="o">/</span><span class="mi">20060613</span> <span class="nx">Camino</span><span class="o">/</span><span class="mf">1.0</span><span class="o">.</span><span class="mi">2</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::accept_lang">
<tt class="descname">accept_lang</tt><big>(</big><span class="optional">[</span><em>$lang = 'en'</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_User_agent::accept_lang" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$lang</strong> (<em>string</em>) – Language key</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if provided language is accepted, FALSE if not</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
</td>
</tr>
</tbody>
</table>
<p>Lets you determine if the user agent accepts a particular language. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">accept_lang</span><span class="p">(</span><span class="s1">'en'</span><span class="p">))</span>
<span class="p">{</span>
<span class="k">echo</span> <span class="s1">'You accept English!'</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This method is not typically very reliable since some browsers do not provide language info,
and even among those that do, it is not always accurate.</p>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::languages">
<tt class="descname">languages</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_User_agent::languages" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">An array list of accepted languages</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td>
</tr>
</tbody>
</table>
<p>Returns an array of languages supported by the user agent.</p>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::accept_charset">
<tt class="descname">accept_charset</tt><big>(</big><span class="optional">[</span><em>$charset = 'utf-8'</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_User_agent::accept_charset" 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><strong>$charset</strong> (<em>string</em>) – Character set</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the character set is accepted, FALSE if not</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
</td>
</tr>
</tbody>
</table>
<p>Lets you determine if the user agent accepts a particular character set. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">agent</span><span class="o">-></span><span class="na">accept_charset</span><span class="p">(</span><span class="s1">'utf-8'</span><span class="p">))</span>
<span class="p">{</span>
<span class="k">echo</span> <span class="s1">'You browser supports UTF-8!'</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This method is not typically very reliable since some browsers do not provide character-set info,
and even among those that do, it is not always accurate.</p>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::charsets">
<tt class="descname">charsets</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_User_agent::charsets" 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">An array list of accepted character sets</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td>
</tr>
</tbody>
</table>
<p>Returns an array of character sets accepted by the user agent.</p>
</dd></dl>
<dl class="method">
<dt id="CI_User_agent::parse">
<tt class="descname">parse</tt><big>(</big><em>$string</em><big>)</big><a class="headerlink" href="#CI_User_agent::parse" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$string</strong> (<em>string</em>) – A custom user-agent string</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">void</p>
</td>
</tr>
</tbody>
</table>
<p>Parses a custom user-agent string, different from the one reported by the current visitor.</p>
</dd></dl>
</dd></dl>
</div>
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