php dom get all attributes of a node

Question

is there any easy way of getting all attributes of a node without checking if it has that attribute? short, here's an example of what i'm trying to do: i have this short domdocument:

<p align=center style="font-size: 12px;">some text</p>
<a href="#" target="_blank">some link<a/>

okay.. now if i check p tag with getAttribute('align') i'll get the center value.. that's cool, but i want to see if p tag has also another attribute like style without checking for every attribute possible. on img tag i'll have to check for src, width, height, style, onclick, etc.. to verify if they exists.. but i'm thinking it might be a easier way of seeing all attributes.

Answer 1

Considering you have your node as a DOMElement or DOMNode, you can use the $attributes property of the DOMNode class : it contains a list of the attributes that the node has.

Using that property, you can loop over the attributes, getting the name and value of each one, with their $nodeName and $nodeValue properties.

For instance, in your case, you could use something like this :

$str = <<<STR
<p align=center style="font-size: 12px;">some text</p>
<a href="#" target="_blank">some link<a/>
STR;

$dom = new DOMDocument();
$dom->loadHTML($str);

$p = $dom->getElementsByTagName('p')->item(0);
if ($p->hasAttributes()) {
  foreach ($p->attributes as $attr) {
    $name = $attr->nodeName;
    $value = $attr->nodeValue;
    echo "Attribute '$name' :: '$value'<br />";
  }
}

Which would get you this kind of output :

Attribute 'align' :: 'center'
Attribute 'style' :: 'font-size: 12px;'

i.e. we have the two attributes of the node, without knowing their names before ; and for each attribute, we can obtain its name and its value.