$header = <<< HTML
<link rel="stylesheet" href="http://$home_urlcss/style.css" />
HTML;
home_urlcssがない

$home_url = 'www.example.com/';
$header = <<< HTML
<link rel="stylesheet" href="http://{$home_url}css/style.css" />
HTML;
<link rel="stylesheet" href="http://www.hogehoge.com/css/style.css" />


http://{www.hogehoge.com/}css/style.cssが　気になる