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<div class="section" id="uri-class">
<h1>URI Class<a class="headerlink" href="#uri-class" title="Permalink to this headline">¶</a></h1>
<p>The URI Class provides methods that help you retrieve information from
your URI strings. If you use URI routing, you can also retrieve
information about the re-routed segments.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This class is initialized automatically by the system so there
is no need to do it manually.</p>
</div>
<div class="contents local topic" id="contents">
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<li><a class="reference internal" href="#class-reference" id="id1">Class Reference</a></li>
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<div class="custom-index container"></div><div class="section" id="class-reference">
<h2><a class="toc-backref" href="#id1">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="CI_URI">
<em class="property">class </em><tt class="descname">CI_URI</tt><a class="headerlink" href="#CI_URI" title="Permalink to this definition">¶</a></dt>
<dd><dl class="method">
<dt id="CI_URI::segment">
<tt class="descname">segment</tt><big>(</big><em>$n</em><span class="optional">[</span>, <em>$no_result = NULL</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_URI::segment" 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>$n</strong> (<em>int</em>) – Segment index number</li>
<li><strong>$no_result</strong> (<em>mixed</em>) – What to return if the searched segment is not found</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Segment value or $no_result value if not found</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>Permits you to retrieve a specific segment. Where n is the segment
number you wish to retrieve. Segments are numbered from left to right.
For example, if your full URL is this:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">http</span><span class="o">://</span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">news</span><span class="o">/</span><span class="nx">local</span><span class="o">/</span><span class="nx">metro</span><span class="o">/</span><span class="nx">crime_is_up</span>
</pre></div>
</div>
<p>The segment numbers would be this:</p>
<ol class="arabic simple">
<li>news</li>
<li>local</li>
<li>metro</li>
<li>crime_is_up</li>
</ol>
<p>The optional second parameter defaults to NULL and allows you to set the return value
of this method when the requested URI segment is missing.
For example, this would tell the method to return the number zero in the event of failure:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$product_id</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">uri</span><span class="o">-></span><span class="na">segment</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span>
</pre></div>
</div>
<p>It helps avoid having to write code like this:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">uri</span><span class="o">-></span><span class="na">segment</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span> <span class="o">===</span> <span class="k">FALSE</span><span class="p">)</span>
<span class="p">{</span>
<span class="nv">$product_id</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">else</span>
<span class="p">{</span>
<span class="nv">$product_id</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">uri</span><span class="o">-></span><span class="na">segment</span><span class="p">(</span><span class="mi">3</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_URI::rsegment">
<tt class="descname">rsegment</tt><big>(</big><em>$n</em><span class="optional">[</span>, <em>$no_result = NULL</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_URI::rsegment" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$n</strong> (<em>int</em>) – Segment index number</li>
<li><strong>$no_result</strong> (<em>mixed</em>) – What to return if the searched segment is not found</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Routed segment value or $no_result value if not found</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>This method is identical to <tt class="docutils literal"><span class="pre">segment()</span></tt>, except that it lets you retrieve
a specific segment from your re-routed URI in the event you are
using CodeIgniter’s <a class="reference internal" href="../general/routing.html"><em>URI Routing</em></a> feature.</p>
</dd></dl>
<dl class="method">
<dt id="CI_URI::slash_segment">
<tt class="descname">slash_segment</tt><big>(</big><em>$n</em><span class="optional">[</span>, <em>$where = 'trailing'</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_URI::slash_segment" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$n</strong> (<em>int</em>) – Segment index number</li>
<li><strong>$where</strong> (<em>string</em>) – Where to add the slash (‘trailing’ or ‘leading’)</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Segment value, prepended/suffixed with a forward slash, or a slash if not found</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>This method is almost identical to <tt class="docutils literal"><span class="pre">segment()</span></tt>, except it
adds a trailing and/or leading slash based on the second parameter.
If the parameter is not used, a trailing slash added. Examples:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">uri</span><span class="o">-></span><span class="na">slash_segment</span><span class="p">(</span><span class="mi">3</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">uri</span><span class="o">-></span><span class="na">slash_segment</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="s1">'leading'</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-></span><span class="na">uri</span><span class="o">-></span><span class="na">slash_segment</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="s1">'both'</span><span class="p">);</span>
</pre></div>
</div>
<p>Returns:</p>
<ol class="arabic simple">
<li>segment/</li>
<li>/segment</li>
<li>/segment/</li>
</ol>
</dd></dl>
<dl class="method">
<dt id="CI_URI::slash_rsegment">
<tt class="descname">slash_rsegment</tt><big>(</big><em>$n</em><span class="optional">[</span>, <em>$where = 'trailing'</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_URI::slash_rsegment" 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>$n</strong> (<em>int</em>) – Segment index number</li>
<li><strong>$where</strong> (<em>string</em>) – Where to add the slash (‘trailing’ or ‘leading’)</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Routed segment value, prepended/suffixed with a forward slash, or a slash if not found</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>This method is identical to <tt class="docutils literal"><span class="pre">slash_segment()</span></tt>, except that it lets you
add slashes a specific segment from your re-routed URI in the event you
are using CodeIgniter’s <a class="reference internal" href="../general/routing.html"><em>URI Routing</em></a>
feature.</p>
</dd></dl>
<dl class="method">
<dt id="CI_URI::uri_to_assoc">
<tt class="descname">uri_to_assoc</tt><big>(</big><span class="optional">[</span><em>$n = 3</em><span class="optional">[</span>, <em>$default = array()</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_URI::uri_to_assoc" 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>$n</strong> (<em>int</em>) – Segment index number</li>
<li><strong>$default</strong> (<em>array</em>) – Default values</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Associative URI segments array</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">array</p>
</td>
</tr>
</tbody>
</table>
<p>This method lets you turn URI segments into an associative array of
key/value pairs. Consider this URI:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">user</span><span class="o">/</span><span class="nx">search</span><span class="o">/</span><span class="nx">name</span><span class="o">/</span><span class="nx">joe</span><span class="o">/</span><span class="nx">location</span><span class="o">/</span><span class="nx">UK</span><span class="o">/</span><span class="nx">gender</span><span class="o">/</span><span class="nx">male</span>
</pre></div>
</div>
<p>Using this method you can turn the URI into an associative array with
this prototype:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="p">[</span><span class="k">array</span><span class="p">]</span>
<span class="p">(</span>
<span class="s1">'name'</span> <span class="o">=></span> <span class="s1">'joe'</span>
<span class="s1">'location'</span> <span class="o">=></span> <span class="s1">'UK'</span>
<span class="s1">'gender'</span> <span class="o">=></span> <span class="s1">'male'</span>
<span class="p">)</span>
</pre></div>
</div>
<p>The first parameter lets you set an offset, which defaults to 3 since your
URI will normally contain a controller/method pair in the first and second segments.
Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$array</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">uri</span><span class="o">-></span><span class="na">uri_to_assoc</span><span class="p">(</span><span class="mi">3</span><span class="p">);</span>
<span class="k">echo</span> <span class="nv">$array</span><span class="p">[</span><span class="s1">'name'</span><span class="p">];</span>
</pre></div>
</div>
<p>The second parameter lets you set default key names, so that the array
returned will always contain expected indexes, even if missing from the URI.
Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$default</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'name'</span><span class="p">,</span> <span class="s1">'gender'</span><span class="p">,</span> <span class="s1">'location'</span><span class="p">,</span> <span class="s1">'type'</span><span class="p">,</span> <span class="s1">'sort'</span><span class="p">);</span>
<span class="nv">$array</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">uri</span><span class="o">-></span><span class="na">uri_to_assoc</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="nv">$default</span><span class="p">);</span>
</pre></div>
</div>
<p>If the URI does not contain a value in your default, an array index will
be set to that name, with a value of NULL.</p>
<p>Lastly, if a corresponding value is not found for a given key (if there
is an odd number of URI segments) the value will be set to NULL.</p>
</dd></dl>
<dl class="method">
<dt id="CI_URI::ruri_to_assoc">
<tt class="descname">ruri_to_assoc</tt><big>(</big><span class="optional">[</span><em>$n = 3</em><span class="optional">[</span>, <em>$default = array()</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_URI::ruri_to_assoc" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>$n</strong> (<em>int</em>) – Segment index number</li>
<li><strong>$default</strong> (<em>array</em>) – Default values</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Associative routed URI segments array</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">array</p>
</td>
</tr>
</tbody>
</table>
<p>This method is identical to <tt class="docutils literal"><span class="pre">uri_to_assoc()</span></tt>, except that it creates
an associative array using the re-routed URI in the event you are using
CodeIgniter’s <a class="reference internal" href="../general/routing.html"><em>URI Routing</em></a> feature.</p>
</dd></dl>
<dl class="method">
<dt id="CI_URI::assoc_to_uri">
<tt class="descname">assoc_to_uri</tt><big>(</big><em>$array</em><big>)</big><a class="headerlink" href="#CI_URI::assoc_to_uri" 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>$array</strong> (<em>array</em>) – Input array of key/value pairs</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">URI string</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>Takes an associative array as input and generates a URI string from it.
The array keys will be included in the string. Example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$array</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'product'</span> <span class="o">=></span> <span class="s1">'shoes'</span><span class="p">,</span> <span class="s1">'size'</span> <span class="o">=></span> <span class="s1">'large'</span><span class="p">,</span> <span class="s1">'color'</span> <span class="o">=></span> <span class="s1">'red'</span><span class="p">);</span>
<span class="nv">$str</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">uri</span><span class="o">-></span><span class="na">assoc_to_uri</span><span class="p">(</span><span class="nv">$array</span><span class="p">);</span>
<span class="c1">// Produces: product/shoes/size/large/color/red</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_URI::uri_string">
<tt class="descname">uri_string</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_URI::uri_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">URI 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 with the complete URI. For example, if this is your full URL:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">http</span><span class="o">://</span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">news</span><span class="o">/</span><span class="nx">local</span><span class="o">/</span><span class="mi">345</span>
</pre></div>
</div>
<p>The method would return this:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">news</span><span class="o">/</span><span class="nx">local</span><span class="o">/</span><span class="mi">345</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_URI::ruri_string">
<tt class="descname">ruri_string</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_URI::ruri_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">Routed URI 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>This method is identical to <tt class="docutils literal"><span class="pre">uri_string()</span></tt>, except that it returns
the re-routed URI in the event you are using CodeIgniter’s <a class="reference internal" href="../general/routing.html"><em>URI
Routing</em></a> feature.</p>
</dd></dl>
<dl class="method">
<dt id="CI_URI::total_segments">
<tt class="descname">total_segments</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_URI::total_segments" 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">Count of URI segments</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">int</td>
</tr>
</tbody>
</table>
<p>Returns the total number of segments.</p>
</dd></dl>
<dl class="method">
<dt id="CI_URI::total_rsegments">
<tt class="descname">total_rsegments</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_URI::total_rsegments" 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">Count of routed URI segments</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">int</td>
</tr>
</tbody>
</table>
<p>This method is identical to <tt class="docutils literal"><span class="pre">total_segments()</span></tt>, except that it returns
the total number of segments in your re-routed URI in the event you are
using CodeIgniter’s <a class="reference internal" href="../general/routing.html"><em>URI Routing</em></a> feature.</p>
</dd></dl>
<dl class="method">
<dt id="CI_URI::segment_array">
<tt class="descname">segment_array</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_URI::segment_array" 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">URI segments array</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 containing the URI segments. For example:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$segs</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">uri</span><span class="o">-></span><span class="na">segment_array</span><span class="p">();</span>
<span class="k">foreach</span> <span class="p">(</span><span class="nv">$segs</span> <span class="k">as</span> <span class="nv">$segment</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">echo</span> <span class="nv">$segment</span><span class="p">;</span>
<span class="k">echo</span> <span class="s1">'<br />'</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="CI_URI::rsegment_array">
<tt class="descname">rsegment_array</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_URI::rsegment_array" 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">Routed URI segments array</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td>
</tr>
</tbody>
</table>
<p>This method is identical to <tt class="docutils literal"><span class="pre">segment_array()</span></tt>, except that it returns
the array of segments in your re-routed URI in the event you are using
CodeIgniter’s <a class="reference internal" href="../general/routing.html"><em>URI Routing</em></a> feature.</p>
</dd></dl>
</dd></dl>
</div>
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