[PHP HTML] Creare una Select annidata con caratteri ascii

[boots]

Prova così (anche se non sono sicurissimo):

function HTMLOptions($menu, $sel_id ='', $parentid = 0, $depth = 0, $v = []) 
{
    $children=array();
    $result = '';
    foreach ($menu as $item) if ($item["parentid"] == $parentid)
        $children[]=$item;
    
    foreach ($children as $key => $child)
    { 
        $symbol = '';
        if ($depth > 0){
            $symbol = str_repeat('&nbsp',7);
            for($i=0; $i < $depth -1; $i++ ){
              
                if($v[$i +2] == 1){
                   $symbol .= '│'.str_repeat('&nbsp',7); 
                }else{
                    $symbol .= str_repeat('&nbsp',8); 

                }
            }

            $symbol .= (($key == (count($children)-1)) ? '└' : '├').'─&nbsp;';
        }

        $result .= '<option value="'.$child["id"].'" '.($child["id"]==$sel_id ? 'selected':'').'>'.$symbol.$child["title"].'</option>'."\n";
        $v[$depth +1] = ($key == count($children) - 1) ? 0 : 1 ;
        
        $result.=HTMLOptions($menu, $sel_id, $child["id"], $depth+1, $v); 
    } 


    return $result ?  $result : null; 
}