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    <p>Assuming it's something of this sort:</p> <pre><code>$ary = Array( 0 =&gt; Array( 'parent_category_id' =&gt; null, 'sort_order' =&gt; 0, 'name' =&gt; 'my-category-name0' ), 1 =&gt; Array( 'parent_category_id' =&gt; 0, 'sort_order' =&gt; 1, 'name' =&gt; 'my-category-name1' ), 2 =&gt; Array( 'parent_category_id' =&gt; 0, 'sort_order' =&gt; 2, 'name' =&gt; 'my-category-name2' ), 3 =&gt; Array( 'parent_category_id' =&gt; null, 'sort_order' =&gt; 0, 'name' =&gt; 'my-category-name3' ), 4 =&gt; Array( 'parent_category_id' =&gt; 3, 'sort_order' =&gt; 0, 'name' =&gt; 'my-category-name4' ) ); </code></pre> <p>You can use a combination of a foreach and <a href="http://www.php.net/manual/en/function.usort.php" rel="nofollow">usort</a> to achieve what you're going for.</p> <pre><code>// @array: the array you're searchign through // @parent_id: the parent id you're filtering by function getFromParent($array, $parent_id){ $result = Array(); foreach ($array as $category_id =&gt; $entry){ if ($entry['parent_category_id']===$parent_id) $result[$category_id] = $entry; } usort($result,create_function('$a,$b','return ($a["sort_order"]&gt;$b["sort_order"]?1:($b["sort_order"]&lt;$a["sort_order"]?-1:0));')); return $result; } var_export(getFromParent($ary,0)); </code></pre> <p><strong>EDIT</strong> Sorry, fixed some syntax errors. Tested, and works (at least to result in what I was intending)<br> <strong>EDITv2</strong> Here's the raw output from the above:</p> <pre><code>array ( 0 =&gt; array ( 'parent_category_id' =&gt; 0, 'sort_order' =&gt; 1, 'name' =&gt; 'my-category-name1', ), 1 =&gt; array ( 'parent_category_id' =&gt; 0, 'sort_order' =&gt; 2, 'name' =&gt; 'my-category-name2', ), ) </code></pre> <p>(Used var_export just for you @FelixKling)</p> <p><strong>EDITv3</strong> I've updated my answer to go along with the OP's update. I also now make it retain the original "category_id" values in the result array.</p>
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