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    copied!<p>You should use recursion.</p> <p>Here an exemple of code:</p> <pre><code>$datas = array( array('id' =&gt; 1, 'parent' =&gt; 0, 'name' =&gt; 'Page 1'), array('id' =&gt; 2, 'parent' =&gt; 1, 'name' =&gt; 'Page 1.1'), array('id' =&gt; 3, 'parent' =&gt; 2, 'name' =&gt; 'Page 1.1.1'), array('id' =&gt; 4, 'parent' =&gt; 3, 'name' =&gt; 'Page 1.1.1.1'), array('id' =&gt; 5, 'parent' =&gt; 3, 'name' =&gt; 'Page 1.1.1.2'), array('id' =&gt; 6, 'parent' =&gt; 1, 'name' =&gt; 'Page 1.2'), array('id' =&gt; 7, 'parent' =&gt; 6, 'name' =&gt; 'Page 1.2.1'), array('id' =&gt; 8, 'parent' =&gt; 0, 'name' =&gt; 'Page 2'), array('id' =&gt; 9, 'parent' =&gt; 0, 'name' =&gt; 'Page 3'), array('id' =&gt; 10, 'parent' =&gt; 9, 'name' =&gt; 'Page 3.1'), array('id' =&gt; 11, 'parent' =&gt; 9, 'name' =&gt; 'Page 3.2'), array('id' =&gt; 12, 'parent' =&gt; 11, 'name' =&gt; 'Page 3.2.1'), ); function generatePageTree($datas, $parent = 0, $depth=0){ $ni=count($datas); if($ni === 0 || $depth &gt; 1000) return ''; // Make sure not to have an endless recursion $tree = '&lt;ul&gt;'; for($i=0; $i &lt; $ni; $i++){ if($datas[$i]['parent'] == $parent){ $tree .= '&lt;li&gt;'; $tree .= $datas[$i]['name']; $tree .= generatePageTree($datas, $datas[$i]['id'], $depth+1); $tree .= '&lt;/li&gt;'; } } $tree .= '&lt;/ul&gt;'; return $tree; } echo(generatePageTree($datas)); </code></pre> <p>You can test it at: <a href="http://phpfiddle.org/main/code/1qy-5fj" rel="nofollow noreferrer">http://phpfiddle.org/main/code/1qy-5fj</a></p> <p>Or if you want the exact format:</p> <pre><code>function generatePageTree($datas, $parent = 0, $depth = 0){ $ni=count($datas); if($ni === 0 || $depth &gt; 1000) return ''; // Make sure not to have an endless recursion $tree = ''; for($i=0; $i &lt; $ni; $i++){ if($datas[$i]['parent'] == $parent){ $tree .= str_repeat('-', $depth); $tree .= $datas[$i]['name'] . '&lt;br/&gt;'; $tree .= generatePageTree($datas, $datas[$i]['id'], $depth+1); } } return $tree; } </code></pre> <p>The test: <a href="http://phpfiddle.org/main/code/jw3-s1j" rel="nofollow noreferrer">http://phpfiddle.org/main/code/jw3-s1j</a></p>
 

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