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| User Agent Class | |
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| <h1>User Agent Class</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> | |
| <h2>Initializing the Class</h2> | |
| <p>Like most other classes in Code Igniter, the User Agent class is initialized in your controller using the <dfn>$this->load->library</dfn> function:</p> | |
| <code>$this->load->library('user_agent');</code> | |
| <p>Once loaded, the object will be available using: <dfn>$this->agent</dfn></p> | |
| <h2>User Agent Definitions</h2> | |
| <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 | |
| various user agent arrays if needed.</p> | |
| <h2>Example</h2> | |
| <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. | |
| <code> | |
| $this->load->library('user_agent');<br /> | |
| <br /> | |
| if ($this->agent->is_browser())<br /> | |
| {<br /> | |
| $agent = $this->agent->browser().' '.$this->agent->version();<br /> | |
| }<br /> | |
| elseif ($this->agent->is_robot())<br /> | |
| {<br /> | |
| $agent = $this->agent->robot();<br /> | |
| }<br /> | |
| elseif ($this->agent->is_mobile())<br /> | |
| {<br /> | |
| $agent = $this->agent->mobile();<br /> | |
| }<br /> | |
| else<br /> | |
| {<br /> | |
| $agent = 'Unidentified User Agent';<br /> | |
| }<br /> | |
| <br /> | |
| echo $agent;<br /> | |
| <br /> | |
| echo $this->agent->platform(); // Platform info (Windows, Linux, Mac, etc.) | |
| </code> | |
| <br /> | |
| <h1>Function Reference</h1> | |
| <h2>$this->agent->is_browser()</h2> | |
| <p>Returns TRUE/FALSE (boolean) if the user agent is a known web browser.</p> | |
| <h2>$this->agent->is_mobile()</h2> | |
| <p>Returns TRUE/FALSE (boolean) if the user agent is a known mobile device.</p> | |
| <h2>$this->agent->is_robot()</h2> | |
| <p>Returns TRUE/FALSE (boolean) if the user agent is a known robot.</p> | |
| <p class="important"><strong>Note:</strong> 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 | |
| <dfn>application/config/user_agents.php</dfn> file.</p> | |
| <h2>$this->agent->is_referral()</h2> | |
| <p>Returns TRUE/FALSE (boolean) if the user agent was referred from another site.</p> | |
| <h2>$this->agent->browser()</h2> | |
| <p>Returns a string containing the name of the web browser viewing your site.</p> | |
| <h2>$this->agent->version()</h2> | |
| <p>Returns a string containing the version number of the web browser viewing your site.</p> | |
| <h2>$this->agent->mobile()</h2> | |
| <p>Returns a string containing the name of the mobile device viewing your site.</p> | |
| <h2>$this->agent->robot()</h2> | |
| <p>Returns a string containing the name of the robot viewing your site.</p> | |
| <h2>$this->agent->platform()</h2> | |
| <p>Returns a string containing the platform viewing your site (Linux, Windows, OS X, etc.).</p> | |
| <h2>$this->agent->referrer()</h2> | |
| <p>The referrer, if the user agent was referred from another site. Typically you'll test for this as follows:</p> | |
| <code> if ($this->agent->is_referral())<br /> | |
| {<br /> | |
| echo $this->agent->referrer();<br /> | |
| }</code> | |
| <h2>$this->agent->agent_string()</h2> | |
| <p>Returns a string containing the full user agent string. Typically it will be something like this:</p> | |
| <code>Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.0.4) Gecko/20060613 Camino/1.0.2</code> | |
| <h2>$this->agent->accept_lang()</h2> | |
| <p>Lets you determine if the user agent accepts a particular language. Example:</p> | |
| <code>if ($this->agent->accept_lang('en'))<br /> | |
| {<br /> | |
| echo 'You accept English!';<br /> | |
| }</cod> | |
| <p class="important"><strong>Note:</strong> This function 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> | |
| <h2>$this->agent->accept_charset()</h2> | |
| <p>Lets you determine if the user agent accepts a particular language. Example:</p> | |
| <code>if ($this->agent->accept_charset('utf-8'))<br /> | |
| {<br /> | |
| echo 'You browser supports UTF-8!';<br /> | |
| }</cod> | |
| <p class="important"><strong>Note:</strong> This function 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> | |
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