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    <p>Assuming your DB is like this:</p> <p>(1, 0, URL1), (3, 1, URL3), (4, 3, URL4), (5, 3, URL5), (2, 0, URL2), (6, 2, URL6)</p> <p>Then you just need to walk up the list</p> <p>e.g. </p> <pre><code>function get_top_parent($category_id, $root_id=0) { // Grab the id's and category's $item_list = array(); foreach($this-&gt;items as $item) { $item_list[$item['id']] = $item['category_id']; } $current_category = $category_id; while(TRUE) { if ($item_list[$current_category] == $root_id) { // Check to see if we have found the parent category. return $current_category; } else { // update our current category $current_category = $item_list[$current_category]; } } } function get_parents($category_id, $root_id=0) { $parents = array(); // Grab the id's and category's $item_list = array(); foreach($this-&gt;items as $item) { $item_list[$item['id']] = $item['category_id']; } $current_category = $category_id; while(TRUE) { // Check to see if we have found the root category. if ($item_list[$current_category] == $root_id) { return $parents; } else { // update our current category and parents $current_category = $item_list[$current_category]; array_unshift($parents, $current_category); } } } </code></pre> <p>reworked to return URL (I did not verify this code but it should work):</p> <pre><code>function get_top_parent($category_id, $root_id=0) { // Grab the id's and category's $item_list = array(); foreach($this-&gt;items as $item) { $item_list[$item['id']] = array( 'category_id' =&gt; $item['category_id'], 'url' =&gt; $item['url'] ); } $current_category = $category_id; while(TRUE) { if ($item_list[$current_category]['category_id'] == $root_id) { // Check to see if we have found the parent category. return $item_list[$current_category]['url']; } else { // update our current category $current_category = $item_list[$current_category]['category_id']; } } } function get_parents($category_id, $root_id=0) { $parents = array(); // Grab the id's and category's $item_list = array(); foreach($this-&gt;items as $item) { $item_list[$item['id']] = array( 'category_id' =&gt; $item['category_id'], 'url' =&gt; $item['url'] ); } $current_category = $category_id; while(TRUE) { // Check to see if we have found the root category. if ($item_list[$current_category]['category_id'] == $root_id) { return $parents; } else { $temp_array = array( 'category_id' =&gt; $current_category 'url' =&gt; $item_list[$current_category]['url'] ); // update our current category and parents $current_category = $item_list[$current_category]['category_id']; array_unshift($parents, $temp_array); } } } </code></pre> <p>The first function returns the URL, the second function should return an array of arrays... You will have the standard index, with "category_id" and "url" as nested/sub arrays... (If in doubt, just do a print_r of the return value to see what I mean)</p> <p>again, i checkced the origional code but not the update...</p>
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    1. POFind the top level parent
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    1. COWhat a legend. thanks!
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    2. COYour welcome... Just one word of caution, be careful with the WHILE(TRUE) statments... They could result in an endless loop that times out your script (if the structure of the db heirarchy is bad or missing parent cateogires)... You may want to setup some sort of counter or timer that will kill the loop (e.g. "RETURN FALSE")
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    3. COThanks for the advice. Do you know how to return the url instead of the id? would i need an each loop in the while loop?
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