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POFlatten a nested PHP hierarchal array into string representations
 

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    <p>Given an array:</p> <pre><code>0 =&gt; ( [parent_id] =&gt; null, [name] =&gt; "Root" [children] =&gt; array( 10 =&gt; array( [parent_id] =&gt; 0, [name] =&gt; "Category A", [children] =&gt; array( 30 =&gt; array( [parent_id] =&gt; 10, [name] =&gt; "Category C" ) ) ), 20 =&gt; array( [parent_id] =&gt; 0, [name] =&gt; "Category B" ) ) ) </code></pre> <p>I need to return an array of string representations of those paths...</p> <pre><code>array( [0] =&gt; "Root", [10] =&gt; "Root &gt; Category A", [30] =&gt; "Root &gt; Category A &gt; Category C", [20] =&gt; "Root &gt; Category B" ) </code></pre> <p>I've been messing around doing this recursively but I'm having some trouble doing it efficiently. Are there simple ways to do this that I'm just overlooking?</p> <p><strong>EDIT:</strong></p> <p>Solution is simply a slightly modified version of Alexander Varwijk's answer. A few tweaks to handle non-existent children, calling the function recursively via <strong>FUNCTION</strong> constant so it's easy to change the function name and a change from array_merge to the + operator to combine the arrays in order to preserve keys.</p> <pre><code>function flatten($data, $prefix = "", $item_seperator = "/") { $seperator = $prefix == "" ? "" : $item_seperator; $return = array(); if (is_array($data)) { foreach($data as $key =&gt; $value) { $return[$value["endeca_id"]] = $prefix . $seperator . $value["url_key"]; if(array_key_exists("children", $value)) { $return = $return + call_user_func(__FUNCTION__, $value["children"], $prefix . $seperator . $value["url_key"], $item_seperator); } } } return $return; } </code></pre>
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    1. COI'd say recursion it the way to go here. Care to show your best try yet?
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