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    copied!<p>If I understand your problem correctly, this should work. Notice how I call the <code>orderMe</code> function inside the function to make it recursive.</p> <pre><code>function orderMe($input, $parentId) { $return = array($parentId =&gt; array('itemGroupID' =&gt; $parentId)); $childs = array(); foreach ($input as $i) { if ($i['itemGroupID'] == $parentId) { $return[$i['itemGroupID']]['children'][$i['childItemGroupID']] = array('itemGroupID' =&gt; $i['childItemGroupID']); $childs[] = $i['childItemGroupID']; } if (in_array($i['childItemGroupID'], $childs)) { $allChilds = orderMe($input, $i['childItemGroupID']); if (!empty($allChilds[$i['childItemGroupID']]['children'])) $return[$i['itemGroupID']]['children'][$i['childItemGroupID']] = $allChilds; } } return $return; } print_r(orderMe($input, 1)); </code></pre> <p>Outputs:</p> <pre><code>array ( 1 =&gt; array ( 'itemGroupID' =&gt; 1, 'children' =&gt; array ( 2 =&gt; array ( 'itemGroupID' =&gt; 2, ), 3 =&gt; array ( 'itemGroupID' =&gt; 3, ), 4 =&gt; array ( 'itemGroupID' =&gt; 4, ), 212 =&gt; array ( 'itemGroupID' =&gt; 212, ), 339 =&gt; array ( 'itemGroupID' =&gt; 339, ), 336 =&gt; array ( 'itemGroupID' =&gt; 336, ), 6 =&gt; array ( 6 =&gt; array ( 'itemGroupID' =&gt; 6, 'children' =&gt; array ( 8 =&gt; array ( 'itemGroupID' =&gt; 8, ), 9 =&gt; array ( 9 =&gt; array ( 'itemGroupID' =&gt; 9, 'children' =&gt; array ( 15 =&gt; array ( 'itemGroupID' =&gt; 15, ), ), ), ), 10 =&gt; array ( 10 =&gt; array ( 'itemGroupID' =&gt; 10, 'children' =&gt; array ( 16 =&gt; array ( 'itemGroupID' =&gt; 16, ), ), ), ), 11 =&gt; array ( 11 =&gt; array ( 'itemGroupID' =&gt; 11, 'children' =&gt; array ( 17 =&gt; array ( 'itemGroupID' =&gt; 17, ), ), ), ), 12 =&gt; array ( 12 =&gt; array ( 'itemGroupID' =&gt; 12, 'children' =&gt; array ( 18 =&gt; array ( 'itemGroupID' =&gt; 18, ), ), ), ), 13 =&gt; array ( 13 =&gt; array ( 'itemGroupID' =&gt; 13, 'children' =&gt; array ( 19 =&gt; array ( 'itemGroupID' =&gt; 19, ), ), ), ), 74 =&gt; array ( 74 =&gt; array ( 'itemGroupID' =&gt; 74, 'children' =&gt; array ( 75 =&gt; array ( 'itemGroupID' =&gt; 75, ), ), ), ), ), ), ), 5 =&gt; array ( 'itemGroupID' =&gt; 5, ), ), ), ) </code></pre>
 

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