Move class attribute value to php variable

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:

get value of the class="" of each <li>.
if active exists in this value, then go to 3) step.
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?

What’s the difference to Move title attribute value to class attribute value in the HTML code? — Gumbo
– Gumbo, Commented Oct 24, 2010 at 15:03
This seems really convoluted. What's the ultimate goal here? — Brad Mace
– Brad Mace, Commented Oct 24, 2010 at 15:07
Yes, it would seem much simpler to have the function pass back the value you want than to encase it in HTML cruft and then try to scrape the original value back out of the HTML. — bobince
– bobince, Commented Oct 24, 2010 at 15:15
@Happy: In what way is it different to Move title attribute value to class attribute value in the HTML code (sorry, had liked the wrong question)? You want to extract some HTML attribute value – just like in the other question. — Gumbo
– Gumbo, Commented Oct 24, 2010 at 15:19

ITroubs · Accepted Answer · 2010-10-24 15:05:34Z

3

Use an XPath query.

see here:http://php.net/manual/en/domxpath.query.php

answered Oct 24, 2010 at 15:05

ITroubs

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1 Comment

Gordon Over a year ago

@Happy I already gave you all the example you need to solve your problem. Why not actually go the PHP Manual and learn how to use DOM instead of expecting people to provide you the codes you can copy and paste. Dont ask for a fish. Learn how to fish.

dev-null-dweller · Accepted Answer · 2010-10-24 15:49:09Z

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;

edited Oct 24, 2010 at 15:49

answered Oct 24, 2010 at 15:33

dev-null-dweller

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Comments

Alex Rashkov · Accepted Answer · 2010-10-24 15:04:43Z

0

You should use Regular Expressions.

Or if you can catch each Li item classes in the previous functions might be easier.

answered Oct 24, 2010 at 15:04

Alex Rashkov

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2 Comments

ITroubs Over a year ago

You should park your car with a stone under your tire. But you also could just juse something the car has already made for that purpose like a handbrake(XPath for querying xml documents).

James Over a year ago

what's wrong with regex? It takes much memory to handle, or much time, or what else, why you hate it?

Davis Peixoto · Accepted Answer · 2010-10-24 15:33:10Z

I think you should wrap the solution into a function.

Regular Expressions fit for the job, but I think you can also use DOM class. Something like:

$menu = '<ul id="menu">
    <li id="some-id" class="many classes one"><a href="#">text</a></li>
    <li id="some-id" class="many classes two active"><a href="#">text</a></li>
    <li id="some-id" class="many classes three"><a href="#">text</a></li>
</ul>';
// using a constant instead a "magic number" inside below function
define(NUMBER_POSITION, 2);
function getActiveItem($menuStr) {
    $doc = new DOMDocument();
    $doc->loadXML($menuStr);
    $listItems = $doc->getElementsByTagName('li');
    foreach($listItems as $listItem) {
        // case count equals 1, expression will be true
        if (substr_count($listItem->getAttribute('class'), 'active')) {
            $classes = explode (' ',$listItem->getAttribute('class'));
            return $classes[NUMBER_POSITION];
        }
    }
}

echo getActiveItem($menu);

That's it.

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