Get All href link from third party URL

getalllinks.php

<?php
$url = "http://stackoverflow.com/";
$ch = curl_init();
$timeout = 5;
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$html = curl_exec($ch);
curl_close($ch);

# Create a DOM parser object
$dom = new DOMDocument();

# loadHTML might throw because of invalid HTML in the page.
@$dom->loadHTML($html);

# Iterate over all the <a> tags
foreach($dom->getElementsByTagName('a') as $link) {
        # Show the <a href>
        echo "https://www.stackoverflow.com".$link->getAttribute('href');
        echo "<br />";
       // echo $link->nodeValue;      
}

To Get All href link from third party URL