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    copied!<p>I see you have excepted an answer, but here's an alternative:</p> <pre><code>&lt;?php $arrayHandler = new ArrayHandler(); $arr = array(); //Adding array examples (without checking) $arr[0]['subcategories'] = array('id'=&gt;80); $arr[0]['subcategories']['whatever'] = array('id'=&gt;82); $arr[0]['subcategories']['whatever']['whatever2'] = array('id'=&gt;83); //Will be added because this is fourth level from $arr[0] $chk = $arrayHandler-&gt;addSubArray($arr[0], $arr[0]['subcategories']['whatever']['whatever2']['whatever3']); if ($chk !== false) { $arr[0]['subcategories']['whatever']['whatever2']['whatever3'] = array('id'=&gt;84); } //Won't be added because this is fitfth level from $arr[0] $chk = $arrayHandler-&gt;addSubArray($arr[0], $arr[0]['subcategories']['whatever']['whatever2']['whatever3']['whatever4']); if ($chk !== false) { $arr[0]['subcategories']['whatever']['whatever2']['whatever3']['whatever4'] = array('id'=&gt;85); } echo print_r($arr,true); class ArrayHandler { private $depthLimit = 4; private $depth = 1; public function addSubArray($checkFromNode, $addNode) { if (is_array($checkFromNode)) { //Do recursion as long as node is an array and count depth //If not an array anymore return value sent to this parameter foreach ($checkFromNode as $key=&gt;$node) { if (is_array($node)) { $this-&gt;depth++; $this-&gt;addSubArray($node, $addNode); } } if (intval($this-&gt;depth) &gt; intval($this-&gt;depthLimit)) { return false; } return true; } } } ?&gt; </code></pre> <p>Output would be in example:</p> <pre><code>Array ( [0] =&gt; Array ( [subcategories] =&gt; Array ( [id] =&gt; 80 [whatever] =&gt; Array ( [id] =&gt; 82 [whatever2] =&gt; Array ( [id] =&gt; 83 [whatever3] =&gt; Array ( [id] =&gt; 84 ) ) ) ) ) ) </code></pre>
 

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