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Simple PHP functions to extract links and metadata from a webpage
<?php
//Created as an alternative to an article demonstrating the use of regular expressions to parse HTML:
// http://www.web-development-blog.com/archives/parse-html-with-preg_match_all/
/**
* @param string $remoteUrl
* @param string $yourLink
* @return bool
*/
function check_back_link($remoteUrl, $yourLink)
{
$document = new DOMDocument('1.1');
$document->loadHtmlFile($remoteUrl);
$linkQuery = new DOMXPath($document);
$results = $linkQuery->evaluate('/html/body//a[@href="' . $yourLink . '"]/');
return ($results->length > 0);
}
/**
* @param string $remoteUrl
* @param string $metaName
* @return array
*/
function extract_meta_data($remoteUrl, $metaName)
{
$document = new DOMDocument('1.1');
$document->loadHtmlFile($remoteUrl);
$linkQuery = new DOMXPath($document);
$results = $linkQuery->evaluate('/html/head/meta[@name="' . $metaName . '"]/@content');
$content = [];
foreach($results as $domAttr) {
$content[] = $domAttr->value;
}
return $content;
}
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