PHP DOM Parser is very good at dealing with XML and HTML. It travels based on tree-structure and loads the data into DOM object. The first thing you need to do is to construct a dom document object and then load the html content in it.
// a new dom object
$dom = new domDocument;
// load the html into the object
// discard white space
$dom->preserveWhiteSpace = false;
There are two important functions that can be used to extract contents from the html structure:
Get Elements by Tag Name
The function getElementsByTagName returns an array of objects.
$tables = $dom->getElementsByTagName('table');
foreach($tables as $table)
The saveHTML function gets the exact html inside that particular node. To get the total number of elements, you the length attribute.
echo 'Found: ' . $tables->length . ' items';