简单的HTML DOM，递归地查找链接

Question

I am using simple html dom to find links on a certain page using:

// Find all links
foreach($html->find('a') as $element)
       echo $element->href . '<br>'; 

This find all the links on the page, however i want to be able to go to found links as well and find links inside those found links recursively for example to level 5.

Any idea of how to go about?

Answer 1

Use a recursive function and keep track of the depth:

function findLinks($url, $depth, $maxDepth) {
  // fetch $url and parse it
  // ...
  if ($depth <= $maxDepth)
    foreach($html->find('a') as $element)
      findLinks($element->href, $depth + 1, $maxDepth);
}

And you would start by calling something like findLinks($rootUrl, 1, 5).