The DOMNode::getLineNo() method doesn't work properly due to a libxml2 bug.
(PHP 5 >= 5.3.0)
DOMNode::getLineNo — Get line number for a node
Gets line number for where the node is defined.
This function has no parameters.
Always returns the line number where the node was defined in.
Example #1 DOMNode::getLineNo() example
// XML dump for below example
$xml = <<<XML
<?xml version="1.0" encoding="utf-8"?>
// Create a new DOMDocument instance
$dom = new DOMDocument;
// Load the XML
// Print where the line where the 'node' element was defined in
printf('The <node> tag is defined on line %d', $dom->getElementsByTagName('node')->item(0)->getLineNo());
The above example will output:
The <node> tag is defined in line 3
This function is buggy. It doesn't always return the correct line number, especially for text elements. As an alternative you can do something like this:
$text = $node->ownerDocument->saveXML($node);
$line += substr_count($text, "\n");
You'll want to keep a reference to $line (starting at 0) and add to it as you parse over the document recursively.
In order for this to work you have to tell DOMDocument to preserve white space before loading the document.