Path Convert relative path to absolute path

Extract a function in Gregarius. Relative paths in web pages can be automatically converted into absolute paths.
function relative_to_absolute($content, $feed_url) {
preg_match('/(http|https|ftp):///', $feed_url, $protocol);
$server_url = preg_replace("/(http |https|ftp|news):///", "", $feed_url);
$server_url = preg_replace("//.*/", "", $server_url);
if ($server_url == '' ) {Re Return $ Content;
}
IF (isset ($ Protocol [0]) {
$ new_content = preg_replace ('/href = "//', 'href ="'. $ Protocol [0]. $ server_url.'/', $content);
$new_content = preg_replace('/src="//', 'src="'.$protocol[0].$server_url.'/', $new_content);
} else {
            $new_content                                                         using       using       using   use using   using   using using ’     using using     through using   out through out through out out through through off ’s    ’’’ ‐ ‐ ‐‐ ‐‐‐‐‐ to
The above introduces the conversion of path relative path into absolute path, including path content. I hope it will be helpful to friends who are interested in PHP tutorials.