Building a Navigation from an Array

navigation.php

<?php

// The big ass array with all the data.
$navigation = [
    [
        'link'  =>      'index.php',
        'title' =>      'Top Level Navigation',
        'children' => [
            [
                'link'  =>      'subitem.php',
                'title' =>      'SubNav1',
                'children' => [
                    [
                        'link'  =>      'subsubitem.php',
                        'title' =>      'SubSubNav1'
                    ]
                ]
            ]
        ]
    ],
    [
        'link'  =>      'index.php',
        'title' =>      'Top Level Navigation',
        'children' => [
            [
                'link'  =>      'subitem.php',
                'title' =>      'SubNav1',
                'children' => [
                    [
                        'link'  =>      'subsubitem.php',
                        'title' =>      'SubSubNav1'
                    ]
                ]
            ],
			      [
                'link'  =>      'subitem.php',
                'title' =>      'SubNav1',
            ]
        ]
    ]
];

// function to build the menu
function buildNav($nav) 
{
	// catch the base url for the links
	$home = "http://" . $_SERVER['SERVER_NAME'] . '/';
	
	$ret = '';
	$ret .= "<ul>";
	
	// loop through each array
	foreach ($nav as $value) {
		// generate the link
		$ret .= '<li><a href="'. $home . $value['link'] .'">'. $value['title'] .'</a></li>';
		
		// if is children, loop again.
        	if (isset($value['children']) && count($value['children'])) {
        		$ret .= buildNav($value['children']);
       		}
    	}
	
	$ret .= "</ul>";

  	return $ret;
	
}

echo buildNav($navigation);

?>