Quickly find all links on a web page

The following PHP script will quickly find all the links on a web page, removing any duplicates and also giving the total count for any duplicate links found.

$html = file_get_contents('https://www.example.com/');
 
$dom = new DOMDocument();

/* Sending any errors to the void */
@$dom->loadHTML($html);
 
/* grab all the href urls on the page */
$xpath = new DOMXPath($dom);
$hrefs = $xpath->evaluate("/html/body//a");
 
 
$urls = array();

for ($i = 0; $i < $hrefs->length; $i++) {
    $href = $hrefs->item($i);
    $url = $href->getAttribute('href');

    /* Do not keep duplicates, also we can get a 
     * count of the duplicate urls if needed. 
     */
    if(array_key_exists($url, $urls)) {
        $urls[$url] = $urls[$url] + 1;
    } else {
        $urls[$url] = 1;
    }
}

/* Print all the urls */
foreach($urls as $url => $count) {
    echo $url.PHP_EOL;
}

You can print the url count if needed for duplicated urls.

/* Print all the urls */
foreach($urls as $url => $count) {
    echo $url. " - ". $count . PHP_EOL;
}