Question

For example, we have xml file with this format:

<A>
      <B>
            <C></C>
            <D></D>
            <D></D>
      </B>
</A>

i need that:
if all “D”-tags elements are empty, then we need to delete whole “A”-tag element

and, of course, we need to do this with all “A”-tags in xml.

Answer 1

Use this algorithm:

• find all the B elements
• for each B element, find all the D elements
• for each D element, check if it’s empty
• if all D elements are empty, fetch the parent of B and remove it from the tree

To do it with the DOM extension, see:

• DOMDocument::loadXML
• DOMNode::childNodes or (less strict) DOMElement::getElementsByTagName
• DOMNode::removeChild