将类属性值移动到php变量

Question

We have variable $menu with HTML inside (there is no loop, it comes from a function).

On echo it gives the code like this:

<ul id="menu">
    <li id="some-id" class="many classes one"><a href="#">text</a></li>
    <li id="some-id" class="many classes second active"><a href="#">text</a></li>
    <li id="some-id" class="many classes three"><a href="#">text</a></li>
</ul>

What I want to do:

1. get value of the class="" of each <li>.

2. if active exists in this value, then go to 3) step.

3. search for one, two, three, four, five inside value. If one of them exists, then throw its name to php variable.

Variable $menu should give:

$name = 'two';

What is the solution?

Answer 1

$html = '<ul id="menu">
    <li id="some-id" class="many classes one"><a href="#">text</a></li>
    <li id="some-id" class="many classes two active"><a href="#">text</a></li>
    <li id="some-id" class="many classes three"><a href="#">text</a></li>
</ul>';

$active = 'active';
$valid = array('one','two','three','four','five');

$x = simplexml_load_string($html);

foreach($x->xpath('//ul/li[contains(@class,'.$active.')]') as $li)
{
    if($common = array_intersect($valid, explode(' ',$li->attributes()->class)))
    {
        $menu = array_shift($common);
        break;
    }
}
echo $menu;