parsing - How should parse with PHP (simple html dom parser) background images and other images of webpage?

Question

How should parse with PHP (simple html dom/etc..) background and other images of webpage?

case 1: inline css

<div id="id100" style="background:url(/mycar1.jpg)"></div>

case 2: css inside html page

<div id="id100"></div>

<style type="text/css">
#id100{
background:url(/mycar1.jpg);
}
</style>

case 3: separate css file

<div id="id100" style="background:url(/mycar1.jpg);"></div>

external.css

#id100{
background:url(/mycar1.jpg);
}

case 4: image inside img tag

solution to case 4 as he appears in php simple html dom parser:

// Create DOM from URL or file
$html = file_get_html('http://www.google.com/');

// Find all images
foreach($html->find('img') as $element)
       echo $element->src . '<br>';

Please help me to parse case 1,2,3.

If exist more cases please write them, with soltion if you can please.

Thanks

Answer 1

For Case 1:

// Create DOM from URL or file 
$html = file_get_html('http://www.google.com/');

// Get the style attribute for the item
$style = $html->getElementById("id100")->getAttribute('style');

// $style = background:url(/mycar1.jpg)
// You would now need to put it into a css parser or do some regular expression magic to get the values you need.

For Case 2/3:

// Create DOM from URL or file
$html = file_get_html('http://www.google.com/');

// Get the Style element
$style = $html->find('head',0)->find('style');

// $style now contains an array of style elements within the head. You will need to work out using attribute selectors what whether an element has a src attribute, if it does download the external css file and parse (using a css parser), if it doesnt then pass the innertext to the css parser.