3v4l.org

run code in 300+ PHP versions simultaneously

@ 2014-10-08T07:56:13Z

<style>
ul{
  list-style: none;
}


    li 
    { 
        position: relative; 
        margin-left: -15px;
        list-style: none;
    }
</style><?php  
$arr = array ( 
'192.168.10.216' => '192.168.40.103',
'192.168.10.217' => '192.168.10.216',
'192.168.10.88' => '192.168.10.216',
'192.168.40.102' => NULL,
'192.168.40.103' => '192.168.40.102',
'192.168.40.104' => '192.168.40.102' );
function parseTree($tree, $root = null) {
    $return = array();
    # Traverse the tree and search for direct children of the root
    foreach($tree as $child => $parent) {
        # A direct child is found
        if($parent == $root) {
            # Remove item from tree (we don't need to traverse this again)
            unset($tree[$child]);
            # Append the child into result array and parse its children
            $return[] = array(
                'name' => $child,
                'children' => parseTree($tree, $child)
            );
        }
    }
    return empty($return) ? null : $return;    
}

function printtree($tree) {
    if(!is_null($tree) && count($tree) > 0) {
        echo '<ul>';
        foreach($tree as $b) {
            echo '<li>'.$b['name'];
            printtree($b['children']);
            echo '</li>';
        }
        echo '</ul>';
    }
}

printtree(parseTree($arr));

Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: <style> ul{ list-style: none; } li { position: relative; margin-left: -15px; list-style: none; } </style><ul><li>192.168.40.102<ul><li>192.168.40.103<ul><li>192.168.10.216<ul><li>192.168.10.217</li><li>192.168.10.88</li></ul></li></ul></li><li>192.168.40.104</li></ul></li></ul>

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