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    copied!<p><strong>All you need is <a href="http://www.php.net/manual/en/function.uasort.php">uasort</a></strong></p> <pre><code>uasort($list, function ($a, $b) { $a = count($a); $b = count($b); return ($a == $b) ? 0 : (($a &lt; $b) ? -1 : 1); }); </code></pre> <p><strong>Full Example</strong> </p> <pre><code>$list = Array( 'some_first_category' =&gt; Array( 'some_first_name' =&gt; Array( 0=&gt;'first@email.com', 1=&gt;'second@email.com', 2=&gt;'third@email.com', 3=&gt;'fourth@email.com' ), 'some_second_name' =&gt; Array ( 1=&gt;'first@email.com', 2=&gt;'second@email.com'), 'some_third_name' =&gt; Array( 1=&gt;'first@email.com', 2=&gt;'second@email.com', 3=&gt;'third@email.com', 4=&gt;'fourth@email.com' ) ), 'some_second_category' =&gt; Array( 'some_first_name' =&gt; Array( 0=&gt;'first@email.com' ), 'some_second_name' =&gt; Array( 1=&gt;'first@email.com', 2=&gt;'second@email.com', 3=&gt;'third@email.com', 4=&gt;'fourth@email.com'), 'some_third_name' =&gt; Array( 1=&gt;'first@email.com', 2=&gt;'second@email.com')) ); $list = array_map(function ($v) { uasort($v, function ($a, $b) { $a = count($a); $b = count($b); return ($a == $b) ? 0 : (($a &lt; $b) ? 1 : - 1); }); return $v; }, $list); print_r($list); </code></pre> <p>Output </p> <pre><code>Array ( [some_first_category] =&gt; Array ( [some_first_name] =&gt; Array ( [0] =&gt; first@email.com [1] =&gt; second@email.com [2] =&gt; third@email.com [3] =&gt; fourth@email.com ) [some_third_name] =&gt; Array ( [1] =&gt; first@email.com [2] =&gt; second@email.com [3] =&gt; third@email.com [4] =&gt; fourth@email.com ) [some_second_name] =&gt; Array ( [1] =&gt; first@email.com [2] =&gt; second@email.com ) ) [some_second_category] =&gt; Array ( [some_second_name] =&gt; Array ( [1] =&gt; first@email.com [2] =&gt; second@email.com [3] =&gt; third@email.com [4] =&gt; fourth@email.com ) [some_third_name] =&gt; Array ( [1] =&gt; first@email.com [2] =&gt; second@email.com ) [some_first_name] =&gt; Array ( [0] =&gt; first@email.com ) ) ) </code></pre>
 

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