252 lines
8.8 KiB
HTML
252 lines
8.8 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>URI 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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<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 1.7.3</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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URI 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="codeigniter.com/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>URI Class</h1>
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<p>The URI Class provides functions that help you retrieve information from your URI strings. If you use URI routing, you can
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also retrieve information about the re-routed segments.</p>
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<p class="important"><strong>Note:</strong> This class is initialized automatically by the system so there is no need to do it manually.</p>
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<h2>$this->uri->segment(<var>n</var>)</h2>
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<p>Permits you to retrieve a specific segment. Where <var>n</var> is the segment number you wish to retrieve.
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Segments are numbered from left to right. For example, if your full URL is this:</p>
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<code>http://example.com/index.php/news/local/metro/crime_is_up</code>
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<p>The segment numbers would be this:</p>
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<ol>
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<li>news</li>
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<li>local</li>
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<li>metro</li>
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<li>crime_is_up</li>
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</ol>
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<p>By default the function returns FALSE (boolean) if the segment does not exist. There is an optional second parameter that
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permits you to set your own default value if the segment is missing.
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For example, this would tell the function to return the number zero in the event of failure:</p>
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<code>$product_id = $this->uri->segment(3, 0);</code>
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<p>It helps avoid having to write code like this:</p>
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<code>if ($this->uri->segment(3) === FALSE)<br />
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{<br />
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$product_id = 0;<br />
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}<br />
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else<br />
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{<br />
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$product_id = $this->uri->segment(3);<br />
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}<br />
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</code>
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<h2>$this->uri->rsegment(<var>n</var>)</h2>
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<p>This function is identical to the previous one, except that it lets you retrieve a specific segment from your
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re-routed URI in the event you are using CodeIgniter's <a href="../general/routing.html">URI Routing</a> feature.</p>
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<h2>$this->uri->slash_segment(<var>n</var>)</h2>
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<p>This function is almost identical to <dfn>$this->uri->segment()</dfn>, except it adds a trailing and/or leading slash based on the second
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parameter. If the parameter is not used, a trailing slash added. Examples:</p>
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<code>$this->uri->slash_segment(<var>3</var>);<br />
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$this->uri->slash_segment(<var>3</var>, 'leading');<br />
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$this->uri->slash_segment(<var>3</var>, 'both');</code>
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<p>Returns:</p>
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<ol>
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<li>segment/</li>
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<li>/segment</li>
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<li>/segment/</li>
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</ol>
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<h2>$this->uri->slash_rsegment(<var>n</var>)</h2>
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<p>This function is identical to the previous one, except that it lets you add slashes a specific segment from your
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re-routed URI in the event you are using CodeIgniter's <a href="../general/routing.html">URI Routing</a> feature.</p>
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<h2>$this->uri->uri_to_assoc(<var>n</var>)</h2>
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<p>This function lets you turn URI segments into and associative array of key/value pairs. Consider this URI:</p>
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<code>index.php/user/search/name/joe/location/UK/gender/male</code>
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<p>Using this function you can turn the URI into an associative array with this prototype:</p>
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<code>[array]<br />
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(<br />
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'name' => 'joe'<br />
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'location' => 'UK'<br />
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'gender' => 'male'<br />
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)</code>
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<p>The first parameter of the function lets you set an offset. By default it is set to <kbd>3</kbd> since your
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URI will normally contain a controller/function in the first and second segments. Example:</p>
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<code>
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$array = $this->uri->uri_to_assoc(3);<br />
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<br />
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echo $array['name'];
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</code>
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<p>The second parameter lets you set default key names, so that the array returned by the function will always contain expected indexes, even if missing from the URI. Example:</p>
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<code>
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$default = array('name', 'gender', 'location', 'type', 'sort');<br />
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<br />
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$array = $this->uri->uri_to_assoc(3, $default);</code>
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<p>If the URI does not contain a value in your default, an array index will be set to that name, with a value of FALSE.</p>
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<p>Lastly, if a corresponding value is not found for a given key (if there is an odd number of URI segments) the value will be set to FALSE (boolean).</p>
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<h2>$this->uri->ruri_to_assoc(<var>n</var>)</h2>
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<p>This function is identical to the previous one, except that it creates an associative array using the
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re-routed URI in the event you are using CodeIgniter's <a href="../general/routing.html">URI Routing</a> feature.</p>
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<h2>$this->uri->assoc_to_uri()</h2>
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<p>Takes an associative array as input and generates a URI string from it. The array keys will be included in the string. Example:</p>
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<code>$array = array('product' => 'shoes', 'size' => 'large', 'color' => 'red');<br />
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<br />
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$str = $this->uri->assoc_to_uri($array);<br />
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<br />
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// Produces: product/shoes/size/large/color/red
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</code>
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<h2>$this->uri->uri_string()</h2>
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<p>Returns a string with the complete URI. For example, if this is your full URL:</p>
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<code>http://example.com/index.php/news/local/345</code>
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<p>The function would return this:</p>
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<code>/news/local/345</code>
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<h2>$this->uri->ruri_string(<var>n</var>)</h2>
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<p>This function is identical to the previous one, except that it returns the
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re-routed URI in the event you are using CodeIgniter's <a href="../general/routing.html">URI Routing</a> feature.</p>
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<h2>$this->uri->total_segments()</h2>
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<p>Returns the total number of segments.</p>
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<h2>$this->uri->total_rsegments()</h2>
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<p>This function is identical to the previous one, except that it returns the total number of segments in your
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re-routed URI in the event you are using CodeIgniter's <a href="../general/routing.html">URI Routing</a> feature.</p>
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<h2>$this->uri->segment_array()</h2>
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<p>Returns an array containing the URI segments. For example:</p>
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<code>
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$segs = $this->uri->segment_array();<br />
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<br />
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foreach ($segs as $segment)<br />
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{<br />
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echo $segment;<br />
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echo '<br />';<br />
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}</code>
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<h2>$this->uri->rsegment_array()</h2>
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<p>This function is identical to the previous one, except that it returns the array of segments in your
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re-routed URI in the event you are using CodeIgniter's <a href="../general/routing.html">URI Routing</a> feature.</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="unit_testing.html">Unit Testing 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="user_agent.html">User Agent Class</a>
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</p>
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<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006-2010 · <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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