How to check if dom node list already has the same node

Question

I need to get all parents of all page paragraphs and of all list items by PHP DOMDocument

Let's say, we have such html:

<div>
    <p>Some text</p>
    <p>Some text</p>
</div>
<section>
    <p>Some text</p>
    <p>Some text</p>
    <p>Some text</p>
</section>
<ul>
    <li>Item 1</li>
    <li>Item 2</li>
    <li>Item 3</li>
    <li>Item 4</li>
</ul>

If I use two following loops

$parents = [];
foreach($dom->getElementsByTagName('p') as $paragraph) {
    $parents[] = $paragraph->parentNode;
}
foreach($dom->getElementsByTagName('li') as $li) {
    $parents[] = $li->parentNode;
}

In the end I need just to add a class to each parent like

foreach($parents as $key => $parent) {
     $parent->setAttribute('class', 'prefix_'.$key);
}

and would like to get the output

<div class="prefix_0">
...
</div>
<section class="prefix_1">
...
</section>
<div class="prefix_2">
...
</div>

But I get

<div class="prefix_0 prefix_1">
...
</div>
<section class="prefix_2 prefix_3 prefix_4">
...
</section>
<div class="prefix_5 prefix_6 prefix_7 prefix_8">
...
</div>

If I add the condition

if(!in_array($paragraph->parentNode, $parents)) {

it doesn't work as I see because we have not an array but node list

So how to avoid adding the same parent?

What are you wanting to compare to to verify that the item doesn't exist? nodeValue? — blupointmedia
– blupointmedia, Commented Feb 22, 2019 at 21:41
Is your objective to get one div > p and one section > p in your parent array? — blupointmedia
– blupointmedia, Commented Feb 22, 2019 at 21:42
Can you update your question with sample output expected? ...and an example of what parents has it in already to compare to. — blupointmedia
– blupointmedia, Commented Feb 22, 2019 at 21:53

voodoo417 · Accepted Answer · 2019-02-22 22:03:46Z

2

Very simply function to avoid it:

function compareParentNode($compare_node,$parents){
   foreach($parents as $parent){
       if ($parent->isSameNode($compare_node)) return true;
   }
   return false;
}

Using:

$parents = [];
foreach($dom->getElementsByTagName('p') as $paragraph) {
   $parentNode = $paragraph->parentNode;
   if (!compareParentNode($parentNode,$parents)){   
      $parents[] = $paragraph->parentNode;
   }
}

See more isSameNode

answered Feb 22, 2019 at 22:03

voodoo417

12.2k3 gold badges39 silver badges43 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to check if dom node list already has the same node

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related