<?php
 
$menu = array(
    1 => 'about',
    2 => 'news',
    3 => 'search'
);
 
$submenu = array(
    1 => array( 'about my name', 'about my location' ),
    3 => array( 'search me' )
);
 
if (is_array($menu))
{
    echo '<ul>';
        foreach( $menu as $key=>$row )
        {
            echo '<li>'.$row.'</li>';
            if (is_array($submenu[$key]))
            {
                echo '<ul>';
                foreach( $submenu[$key] as $sub )
                {
                    echo '<li>'.$sub.'</li>';
                }
                echo '</ul>';
            }
        }
    echo '</ul>';
}

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