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    <p>you need to generate something called a super tree and use a recursive function to echo out each branch, this will allow for an unlimited depth tree, but, it also allows for an unknown depth tree.</p> <p><strong>First, SQL:</strong></p> <pre><code>SELECT category_id, parent, category_name </code></pre> <p><strong>Second, use SQL to create tree:</strong></p> <pre><code>$super_tree = array(); while(($row = mysql_fetch_assoc($res)) != NULL) { $parent = $row['parent'] == NULL ? 0 : $row['parent']; //clean up the parent $super_tree[$parent][$row['category_id']] = $row['category_name']; } </code></pre> <p><strong>Third, echo out the tree</strong></p> <pre><code>function echo_branch($tree_branch, $tree_root) { echo("&lt;ul&gt;\n"); //open up our list for this branch foreach($tree_branch as $id =&gt; $name) { //foreach leaf on the branch echo("&lt;li&gt;"); //create a list item echo("&lt;a href=\"#{$id}\"&gt;{$name}&lt;/a&gt;"); //echo out our link if(!empty($tree_root[$id])) { //if our branch has any sub branches, echo those now echo_branch($tree_root[$id], $tree_root); //pass the new branch, plus the root } echo("&lt;/li&gt;\n"); //close off this item } echo("&lt;/ul&gt;\n"); //close off this list } echo_branch($super_tree[0], $super_tree); //echo out unlimited depth tree structure </code></pre> <p>this allows for unlimited depth in your tree structure and allows for simple code to be able to create the structure within the code base.</p> <p>All that you would need to do now is add in your extra's such as classes and your extra html elements in the correct places.</p> <p>if you are looking to track the current depth of the tree to be able to echo different things depending on the depth, you can make the following alterations</p> <p><strong>In the function definition</strong></p> <pre><code>function echo_branch($tree_branch, $tree_root, $depth) { </code></pre> <p><strong>In the recursive call within the if</strong></p> <pre><code>echo_branch($tree_root[$id], $tree_root, $depth++); </code></pre> <p><strong>In the initial call</strong></p> <pre><code>echo_branch($super_tree[0], $super_tree, 0); </code></pre>
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