Problem related to DOMDocument

I am trying to extract all the links ("a" tags) and storing href and anchor text(raw text between the <a> and </a> tags) into Database.

I am having no problem doing this until the contents are an image.

HTML file contains code like following line in many places -
<a href="http://example.com"><img src="example.gif"></a>

My code o
I am using DOM objects but unable to access it.

My code is like -

--------------------
$dom = new DOMDocument();
@$dom->loadHTML($input);
$xpath = new DOMXPath($dom);
$hrefs = $xpath->evaluate("//a");//get all a tags
for ($i = 0; $i < $hrefs->length; $i++)
{
$href = $hrefs->item($i);
$links['link'][$i]=$href->getAttribute('href');
$links['text'][$i]=$href->nodeValue;
}
$dom->save('test.html');

--------------------

If anyone has any idea/suggestion, please share it...

Thanks in advance
- Pankaj