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    <p>You are probably looking for something like this:</p> <pre><code>&lt;?php $items = array('admin/home', 'admin/home/page', 'admin/test', 'site', 'team/tree/template'); sort($items); $previous = array(); foreach ($items as $item) { $path = explode('/', $item); // $i is common nesting level of the previous item // e.g. 0 is nothing in common, 1 is one level in common, etc. for ($i = 0; $i &lt; min(count($path), count($previous)) &amp;&amp; ($path[$i] == $previous[$i]); $i++) { } // close &lt;ul&gt; from previous nesting levels: // that is, we close the amount of levels that the previous and this one have NOT in common for ($k = 0; $k &lt; count($previous)-$i-1; $k++) { echo "&lt;/ul&gt;"; } // $j is the current nesting level // we start at the common nesting level for ($j = $i; $j &lt; count($path); $j++) { // open &lt;ul&gt; for new nesting levels: // i.e., we open a level for every level deeper than the previous level if ($j &gt;= count($previous)) echo "&lt;ul&gt;"; echo "&lt;li&gt;"; // make the path bold if the end of the current path is reached if (count($path)-1 == $j) echo "&lt;b&gt;" . $path[$j] . "&lt;/b&gt;"; else echo $path[$j]; echo "&lt;/li&gt;"; } $previous = $path; } // close remaining &lt;ul&gt; for ($k = 0; $k &lt; count($previous); $k++) { echo "&lt;/ul&gt;"; } ?&gt; </code></pre> <p>Note that I order the array to make sure that all nested items come next to each other.</p> <p>It might have some bugs, but I guess you can work them out yourself. Note that I close the list items before opening a nested <code>&lt;ul&gt;</code>. This is not really how it should; I guess you actually should open the nested <code>&lt;ul&gt;</code> in the final <code>&lt;li&gt;</code> at that level, but you can figure that out yourself.</p> <p><strong>Update</strong> I updated the code to properly close the <code>&lt;ul&gt;</code>'s in some cases.</p>
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    1. CONo, this is perfect thanks - actually it might even be fine the way it is
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