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copied!<p>You can use RecursiveCachingIterator to do what you want. Here is an example, (source: <a href="https://github.com/cballou/PHP-SPL-Iterator-Interface-Examples/blob/master/recursive-caching-iterator.php" rel="nofollow">https://github.com/cballou/PHP-SPL-Iterator-Interface-Examples/blob/master/recursive-caching-iterator.php</a>)</p> <pre><code><?php // example navigation array $nav = array( 'Home' => '/home', 'Fake' => array( 'Double Fake' => array( 'Nested Double Fake' => '/fake/double/nested', 'Doubly Nested Double Fake' => '/fake/double/doubly' ), 'Triple Fake' => '/fake/tripe' ), 'Products' => array( 'Product 1' => '/products/1', 'Product 2' => '/products/2', 'Product 3' => '/products/3', 'Nested Product' => array( 'Nested 1' => '/products/nested/1', 'Nested 2' => '/products/nested/2' ) ), 'Company' => '/company', 'Privacy Policy' => '/privacy-policy' ); class NavBuilder extends RecursiveIteratorIterator { // stores the previous depth private $_depth = 0; // stores the current iteration's depth private $_curDepth = 0; // store the iterator protected $_it; /** * Constructor. * * @access public * @param Traversable $it * @param int $mode * @param int $flags */ public function __construct(Traversable $it, $mode = RecursiveIteratorIterator::SELF_FIRST, $flags = 0) { parent::__construct($it, $mode, $flags); // store the caching iterator $this->_it = $it; } /** * Override the return values. * * @access public */ public function current() { // the return output string $output = ''; // set the current depth $this->_curDepth = parent::getDepth(); // store the difference in depths $diff = abs($this->_curDepth - $this->_depth); // get the name and url of the nav item $name = parent::key(); $url = parent::current(); // close previous nested levels if ($this->_curDepth < $this->_depth) { $output .= str_repeat('</ul></li>', $diff); } // check if we have the last nav item if ($this->hasNext()) { $output .= '<li><a href="' . $url . '">' . $name . '</a>'; } else { $output .= '<li class="last"><a href="' . $url . '">' . $name . '</a>'; } // either add a subnav or close the list item if ($this->hasChildren()) { $output .= '<ul>'; } else { $output .= '</li>'; } // cache the depth $this->_depth = $this->_curDepth; // return the output ( we could've also overridden current()) return $output; } } ?> </code></pre> <p><strong>Usage</strong></p> <pre><code><?php try { // generate the recursive caching iterator $it = new RecursiveCachingIterator(new RecursiveArrayIterator($nav)); // build the navigation with the iterator $it = new NavBuilder($it, RecursiveIteratorIterator::SELF_FIRST); // display the resulting navigation echo '<ul id="nav">' . PHP_EOL; foreach ($it as $value) { echo $value . "\n"; } echo '</ul>' . PHP_EOL; } catch (Exception $e) { var_dump($e); die; } ?> </code></pre>

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