Parsing BlogId from Blogspot.com in PHP using Regex - php

Question

How can i get the blogid from a given blogspot.com url?
I looked at the source code of the webpage from a blogspot.com it looks like this
<link rel="EditURI" type="application/rsd+xml" title="RSD" href="http://www.blogger.com/rsd.g?blogID=4899870735344410268" />
how can i parse this to get the number 4899870735344410268

Answer 1

Use DOMDocument to parse the document and then use its methods to retrieve the wanted element.
I cannot stress this enough: never use regular expressions to parse an HTML document.
function getBlogId($url) {
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_AUTOREFERER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
$page = curl_exec ($ch);
curl_close($ch);
$doc = new DOMDocument();
#$doc->loadHTML($page);
$links = $doc->getElementsByTagName('link');
foreach($links as $link) {
$rel = $link->attributes->getNamedItem('rel');
if($rel && $rel->nodeValue == 'EditURI') {
$href = $link->attributes->getNamedItem('href')->nodeValue;
$query = parse_url($href, PHP_URL_QUERY);
if($query) {
$queryComp = array();
parse_str($query, $queryComp);
if($queryComp['blogID']) {
return $queryComp['blogID'];
}
}
}
}
return false;
}
Example use:
$id = getBlogId('http://thehouseinmarrakesh.blogspot.com/');
echo $id; // 483911541311389592

Answer 2

$pageContents = file_get_contents('blospot_url');
preg_match('~<link rel="EditURI" type="application/rsd\+xml" title="RSD" href="http://www.blogger.com/rsd.g\?blogID=([0-9]+)" />~', $pageContents, $matches);
echo $matches[1];