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    <p>Working with a nested set is a perfect case for recursion.</p> <p>Given your data:</p> <pre><code>$category = array( 'A' =&gt; array('left' =&gt; 1, 'right' =&gt; 9), 'B' =&gt; array('left' =&gt; 2, 'right' =&gt; 4), 'C' =&gt; array('left' =&gt; 5, 'right' =&gt; 8), 'D' =&gt; array('left' =&gt; 6, 'right' =&gt; 7), 'E' =&gt; array('left' =&gt; 10, 'right' =&gt; 11), ); </code></pre> <p>The following will break your nested set data down into a properly nested array in PHP:</p> <pre><code>function createTree($category, $left = 0, $right = null) { $tree = array(); foreach ($category as $cat =&gt; $range) { if ($range['left'] == $left + 1 &amp;&amp; (is_null($right) || $range['right'] &lt; $right)) { $tree[$cat] = createTree($category, $range['left'], $range['right']); $left = $range['right']; } } return $tree; } $tree = createTree($category); print_r($tree); </code></pre> <p>Output:</p> <pre><code>Array ( [A] =&gt; Array ( [B] =&gt; Array ( ) [C] =&gt; Array ( [D] =&gt; Array ( ) ) ) [E] =&gt; Array ( ) ) </code></pre> <p>Then you can flatten your proper tree into the format you want with the following:</p> <pre><code>function flattenTree($tree, $parent_tree = array()) { $out = array(); foreach ($tree as $key =&gt; $children) { $new_tree = $parent_tree; $new_tree[] = $key; if (count($children)) { $child_trees = flattenTree($children, $new_tree); foreach ($child_trees as $tree) { $out[] = $tree; } } else { $out[] = $new_tree; } } return $out; } $tree = flattenTree($tree); print_r($tree); </code></pre> <p>Output: </p> <pre><code>Array ( [0] =&gt; Array ( [0] =&gt; A [1] =&gt; B ) [1] =&gt; Array ( [0] =&gt; A [1] =&gt; C [2] =&gt; D ) [2] =&gt; Array ( [0] =&gt; E ) ) </code></pre>
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    1. POHow do I format Nested Set Model data into an array?
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    1. USSteven Moseley
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    1. COYour function work, many thanks :)
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    2. CO@quocnguyen - Cheers
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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