aaronpk/webmention-verify.php

## webmention-verify.php
<?php
    $html = '<html><body><a href="http://example.com">example</a></body></html>';
    $lookfor = 'http://example.com';

    $doc = new DOMDocument();
    libxml_use_internal_errors(true); # suppress parse errors and warnings
    $body = mb_convert_encoding($html, 'HTML-ENTITIES', mb_detect_encoding($html));
    @$doc->loadHTML($body, LIBXML_NOWARNING|LIBXML_NOERROR);
    libxml_clear_errors();

    $xpath = new DOMXPath($doc);
    foreach($xpath->query('//a[@href]') as $href) {
      $url = $href->getAttribute('href');
      if($url == $lookfor) {
        // FOUND THE LINK!
        echo "Found the link\n";
        break;
      }
    }
	<?php
	$html = '<html><body><a href="http://example.com">example</a></body></html>';
	$lookfor = 'http://example.com';

	$doc = new DOMDocument();
	libxml_use_internal_errors(true); # suppress parse errors and warnings
	$body = mb_convert_encoding($html, 'HTML-ENTITIES', mb_detect_encoding($html));
	@$doc->loadHTML($body, LIBXML_NOWARNING\|LIBXML_NOERROR);
	libxml_clear_errors();

	$xpath = new DOMXPath($doc);
	foreach($xpath->query('//a[@href]') as $href) {
	$url = $href->getAttribute('href');
	if($url == $lookfor) {
	// FOUND THE LINK!
	echo "Found the link\n";
	break;
	}
	}