PHP multiple file_get_contents on data of previous file_get_contents - php

Question

I found this code to check for links on an URL.
<?php
$url = "http://example.com";
$input = #file_get_contents($url);
$dom = new DOMDocument();
$dom->strictErrorChecking = false;
#$dom->loadHTML($input);
$links = $dom->getElementsByTagName('a');
foreach($links as $link) {
if ($link->hasAttribute('href')) {
$href = $link->getAttribute('href');
if (stripos($href, 'shows') !== false) {
echo "<p>http://example.com" . $href . "</p>\n";
}
}
}
?>
Works good, it shows all the links that contains 'shows'.
For example the script above find 3 links, so i get:
<p>http://example.com/shows/Link1</p>
<p>http://example.com/shows/Link2</p>
<p>http://example.com/shows/Link3</p>
Now the thing i try to do is to check those urls i just fetched also for links that contains 'shows'.
To be honest i'm a php noob, so i don't know where to start :(
Regards,
Bart

Answer 1

Something like:
function checklinks($url){
$input = #file_get_contents($url);
$dom = new DOMDocument();
$dom->strictErrorChecking = false;
#$dom->loadHTML($input);
$links = $dom->getElementsByTagName('a');
foreach($links as $link) {
if ($link->hasAttribute('href')) {
$href = $link->getAttribute('href');
if (stripos($href, 'shows') !== false) {
echo "<p>" . $url . "/" . $href . "</p>\n";
checklinks($url . "/" . $href);
}
}
}
}
$url = "http://example.com";
checklinks($url);
Make it recursive - call the function again in the function itself.