Get img src with PHP

I would like to get the SRC attribute into a variable in this example:

<img border="0" src="/images/image.jpg" alt="Image" width="100" height="100" />

So for example - I would like to get a variable $foo = "/images/image.jpg". Important! The src attribute will be dynamic, so it mustn't be hardcoded. Is there any quick and easy way to do this?

Thanks!

EDIT: The image will be a part of a huge string that is basically the content of a news story. So the image is just a part of that.

EDIT2: There will be more images in this string, and I would only want to get the src of the first one. Is this possible?

Use a HTML parser like DOMDocument and then evaluate the value you're looking for with DOMXpath:

$html = '<img id="12" border="0" src="/images/image.jpg"
         alt="Image" width="100" height="100" />';

$doc = new DOMDocument();
$doc->loadHTML($html);
$xpath = new DOMXPath($doc);
$src = $xpath->evaluate("string(//img/@src)"); # "/images/image.jpg"

Or for those who really need to save space:

$xpath = new DOMXPath(@DOMDocument::loadHTML($html));
$src = $xpath->evaluate("string(//img/@src)");

And for the one-liners out there:

$src = (string) reset(simplexml_import_dom(DOMDocument::loadHTML($html))->xpath("//img/@src"));

You would be better off using a DOM parser for this kind of HTML parsing. Consider this code:

$html = '<img id="12" border="0" src="/images/image.jpg"
         alt="Image" width="100" height="100" />';
$doc = new DOMDocument();
libxml_use_internal_errors(true);
$doc->loadHTML($html); // loads your html
$xpath = new DOMXPath($doc);
$nodelist = $xpath->query("//img"); // find your image
$node = $nodelist->item(0); // gets the 1st image
$value = $node->attributes->getNamedItem('src')->nodeValue;
echo "src=$value\n"; // prints src of image

OUTPUT:

src=/images/image.jpg