How to retrieve comments from within an XML Document in PHP

Question

I want to extract all comments below a specific node within an XML document, using PHP. I have tried both the SimpleXML and DOMDocument methods, but I keep getting blank out

Answer 1

Use XMLReader. Comments can be easily detected/found, they are xml elements of type COMMENT. For details see PHP documentation: The XMLReader class

Code example:

$reader = new XMLReader();
$reader->open('filename.xml');
while ($reader->read()){
    if ($reader->nodeType == XMLReader::COMMENT) {
        $comments[] = $reader->readOuterXml();
    }
}

And in array $comments you will have all comments found in XML file.