Question

I am looking at page source and basically want to get the “og:image” image url

I am using the following, which works, and I think (apart from relative URLs issue) covers all eventualities – but it might not be the most efficient way to do it – I have commented the code to show what each line is doing ($html is the source code):

$og_img = explode( '<meta property="og:image" content=', $html); // strip out beginning
$og_img = explode('>', $og_img[1]); // strip out end
if(substr($og_img[0], -1)=='/'){ $og_img[0] = substr($og_img[0], 0, -1); } // strip / if used /> to close the tag
$og_img[0] = str_replace("'", "", $og_img[0]); // strip ' ... ' apostrophes if used
$og_img[0] = str_replace('"', '', $og_img[0]); // strip " ... " doubke quotes if used

Is there a more efficient way?

Answer 1

Don’t roll it yourself.

Go use DOM. E.g.

$doc = new DOMDocument();
@$doc->loadHTML($html);
$metas = $doc->getElementsByTagName('meta');
for ($i = 0; $i < $metas->length; $i++)
{
    $meta = $metas->item($i);
    if($meta->getAttribute('property') == 'og:image')
        $og_image_content = $meta->getAttribute('content');
}

or (haven’t tried it though) use:

get_meta_tags()