226 lines
8.4 KiB
HTML
226 lines
8.4 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>User Agent Class : CodeIgniter User Guide</title>
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<style type='text/css' media='all'>@import url('../userguide.css');</style>
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<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />
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<script type="text/javascript" src="../nav/nav.js"></script>
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<script type="text/javascript" src="../nav/user_guide_menu.js"></script>
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<meta http-equiv= 'pragma' content='no-cache' />
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<meta name='robots' content='all' />
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<meta name='author' content='ExpressionEngine Dev Team' />
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<meta name='description' content='CodeIgniter User Guide' />
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</head>
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<body>
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<!-- START NAVIGATION -->
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<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
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<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div>
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<div id="masthead">
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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<tr>
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<td><h1>CodeIgniter User Guide Version 2.1.4</h1></td>
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<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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</tr>
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</table>
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</div>
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<!-- END NAVIGATION -->
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<!-- START BREADCRUMB -->
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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<tr>
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<td id="breadcrumb">
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<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
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<a href="../index.html">User Guide Home</a> ›
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User Agent Class
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</td>
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<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="ellislab.com/codeigniter/user-guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td>
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</tr>
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</table>
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<!-- END BREADCRUMB -->
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<br clear="all" />
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<!-- START CONTENT -->
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<div id="content">
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<h1>User Agent Class</h1>
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<p>The User Agent Class provides functions that help identify information about the browser, mobile device, or robot visiting your site.
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In addition you can get referrer information as well as language and supported character-set information.</p>
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<h2>Initializing the Class</h2>
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<p>Like most other classes in CodeIgniter, the User Agent class is initialized in your controller using the <dfn>$this->load->library</dfn> function:</p>
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<code>$this->load->library('user_agent');</code>
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<p>Once loaded, the object will be available using: <dfn>$this->agent</dfn></p>
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<h2>User Agent Definitions</h2>
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<p>The user agent name definitions are located in a config file located at: <dfn>application/config/user_agents.php</dfn>. You may add items to the
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various user agent arrays if needed.</p>
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<h2>Example</h2>
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<p>When the User Agent class is initialized it will attempt to determine whether the user agent browsing your site is
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a web browser, a mobile device, or a robot. It will also gather the platform information if it is available.</p>
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<code>
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$this->load->library('user_agent');<br />
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<br />
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if ($this->agent->is_browser())<br />
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{<br />
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$agent = $this->agent->browser().' '.$this->agent->version();<br />
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}<br />
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elseif ($this->agent->is_robot())<br />
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{<br />
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$agent = $this->agent->robot();<br />
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}<br />
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elseif ($this->agent->is_mobile())<br />
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{<br />
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$agent = $this->agent->mobile();<br />
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}<br />
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else<br />
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{<br />
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$agent = 'Unidentified User Agent';<br />
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}<br />
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<br />
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echo $agent;<br />
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<br />
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echo $this->agent->platform(); // Platform info (Windows, Linux, Mac, etc.)
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</code>
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<h1>Function Reference</h1>
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<h2>$this->agent->is_browser()</h2>
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<p>Returns TRUE/FALSE (boolean) if the user agent is a known web browser.</p>
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<code> if ($this->agent->is_browser('Safari'))<br />
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{<br />
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echo 'You are using Safari.';<br />
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}<br />
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else if ($this->agent->is_browser())<br />
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{<br />
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echo 'You are using a browser.';<br />
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}</code>
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<p class="important"><strong>Note:</strong> The string "Safari" in this example is an array key in the list of browser definitions.
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You can find this list in <dfn>application/config/user_agents.php</dfn> if you want to add new browsers or change the stings.</p>
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<h2>$this->agent->is_mobile()</h2>
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<p>Returns TRUE/FALSE (boolean) if the user agent is a known mobile device.</p>
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<code> if ($this->agent->is_mobile('iphone'))<br />
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{<br />
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$this->load->view('iphone/home');<br />
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}<br />
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else if ($this->agent->is_mobile())<br />
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{<br />
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$this->load->view('mobile/home');<br />
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}<br/>
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else<br />
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{<br />
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$this->load->view('web/home');<br />
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}</code>
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<h2>$this->agent->is_robot()</h2>
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<p>Returns TRUE/FALSE (boolean) if the user agent is a known robot.</p>
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<p class="important"><strong>Note:</strong> The user agent library only contains the most common robot
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definitions. It is not a complete list of bots. There are hundreds of them so searching for each one would not be
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very efficient. If you find that some bots that commonly visit your site are missing from the list you can add them to your
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<dfn>application/config/user_agents.php</dfn> file.</p>
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<h2>$this->agent->is_referral()</h2>
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<p>Returns TRUE/FALSE (boolean) if the user agent was referred from another site.</p>
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<h2>$this->agent->browser()</h2>
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<p>Returns a string containing the name of the web browser viewing your site.</p>
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<h2>$this->agent->version()</h2>
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<p>Returns a string containing the version number of the web browser viewing your site.</p>
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<h2>$this->agent->mobile()</h2>
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<p>Returns a string containing the name of the mobile device viewing your site.</p>
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<h2>$this->agent->robot()</h2>
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<p>Returns a string containing the name of the robot viewing your site.</p>
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<h2>$this->agent->platform()</h2>
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<p>Returns a string containing the platform viewing your site (Linux, Windows, OS X, etc.).</p>
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<h2>$this->agent->referrer()</h2>
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<p>The referrer, if the user agent was referred from another site. Typically you'll test for this as follows:</p>
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<code> if ($this->agent->is_referral())<br />
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{<br />
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echo $this->agent->referrer();<br />
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}</code>
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<h2>$this->agent->agent_string()</h2>
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<p>Returns a string containing the full user agent string. Typically it will be something like this:</p>
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<code>Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.0.4) Gecko/20060613 Camino/1.0.2</code>
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<h2>$this->agent->accept_lang()</h2>
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<p>Lets you determine if the user agent accepts a particular language. Example:</p>
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<code>if ($this->agent->accept_lang('en'))<br />
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{<br />
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echo 'You accept English!';<br />
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}</code>
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<p class="important"><strong>Note:</strong> This function is not typically very reliable
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since some browsers do not provide language info, and even among those that do, it is not always accurate. </p>
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<h2>$this->agent->accept_charset()</h2>
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<p>Lets you determine if the user agent accepts a particular character set. Example:</p>
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<code>if ($this->agent->accept_charset('utf-8'))<br />
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{<br />
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echo 'You browser supports UTF-8!';<br />
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}</code>
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<p class="important"><strong>Note:</strong> This function is not typically very reliable
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since some browsers do not provide character-set info, and even among those that do, it is not always accurate. </p>
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</div>
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<!-- END CONTENT -->
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<div id="footer">
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<p>
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Previous Topic: <a href="uri.html">URI Class</a>
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·
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<a href="#top">Top of Page</a> ·
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<a href="../index.html">User Guide Home</a> ·
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Next Topic: <a href="xmlrpc.html">XML-RPC Class</a>
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</p>
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<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2012 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
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</div>
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</body>
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</html>
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