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    <p>Ok, i have managed to cobble together a piece of code which seems to work.</p> <p>I am manually concancenating columns to /column1/column2/column3/column4/column5 strings in a one dimensional array first; Then applying the functions from url given in question to explode this simple array into an array tree. Finally i make use of the makeULLI function to generate an unordered list, with links for each node present. I have extended the code further to add custom paths to URLs depending how deep the link is, for use in SEO friendly links but i stripped that bit out.</p> <p>I am attaching the code which does all this and is suprisingly small. The code should work on any number of levels, I have run it on a table with around 400 rows (5 columns) and it executes in 0.0168 seconds. If anyone can see further optimisations to the code i would be grateful.</p> <pre><code> foreach ($geoArray as $result) { $mynewGEO[] = $result['parent']; $mynewGEO[] = $result['parent'].'/'.$result['child']; $mynewGEO[] = $result['parent'].'/'.$result['child'].'/'.$result['grandchild']; $mynewGEO[] = $result['parent'].'/'.$result['child'].'/'.$result['grandchild'].'/'.$result['grand-grandchild']; $mynewGEO[] = $result['parent'].'/'.$result['child'].'/'.$result['grandchild'].'/'.$result['grand-grandchild'].'/'.$result['grand-grand-grandchild']; } $key_files = array_combine(array_values($mynewGEO), array_values($mynewGEO)); $tree = explodeTree($key_files, "/", true); echo makeULLI($tree); function makeULLI($array) { $return = "&lt;ul&gt;\n"; if (is_array($array) &amp;&amp; count($array) &gt; 0) { foreach ($array as $k =&gt; $v) { if($k == "__base_val") continue; // determine the __base_val value in orde to use for the link. $our_linky = ( is_array($v) ? $v["__base_val"] : $v ); if (is_array($v) &amp;&amp; count($v) &gt; 0) { $return .= "\t&lt;li&gt;&lt;a href=\"".$our_linky."/\" &gt;" . $k ."&lt;/a&gt;". makeULLI($v) . "&lt;/li&gt;\n"; } else { $return .= "\t&lt;li&gt;&lt;a href=\"".$our_linky."/\" &gt;" . $k . "&lt;/a&gt;&lt;/li&gt;\n"; //to return full path //$return .= "\t&lt;li&gt;&lt;a href=\" # \" &gt;" . $v . "&lt;/a&gt;&lt;/li&gt;\n"; } } } else {} $return .= "&lt;/ul&gt;"; return $return; } function explodeTree($array, $delimiter = '_', $baseval = false) { if(!is_array($array)) return false; $splitRE = '/' . preg_quote($delimiter, '/') . '/'; $returnArr = array(); foreach ($array as $key =&gt; $val) { // Get parent parts and the current leaf $parts = preg_split($splitRE, $key, -1, PREG_SPLIT_NO_EMPTY); $leafPart = array_pop($parts); // Build parent structure // Might be slow for really deep and large structures $parentArr = &amp;$returnArr; foreach ($parts as $part) { if (!isset($parentArr[$part])) { $parentArr[$part] = array(); } elseif (!is_array($parentArr[$part])) { if ($baseval) { $parentArr[$part] = array('__base_val' =&gt; $parentArr[$part]); } else { $parentArr[$part] = array(); } } $parentArr = &amp;$parentArr[$part]; } // Add the final part to the structure if (empty($parentArr[$leafPart])) { $parentArr[$leafPart] = $val; } elseif ($baseval &amp;&amp; is_array($parentArr[$leafPart])) { $parentArr[$leafPart]['__base_val'] = $val; } } return $returnArr; } </code></pre>
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