Change a relative URL to absolute URL

Question

for example i\'ve got a string like this:

$html = \'
            test
            

        

Answer 1

The previous answer will cause problems with your first and fourth example because it fails to include a forward slash to separate the page from the page name. Admittedly this can be fixed by simply appending it to the $domain, but if you do that then href="/something.php" will end up with two.

Just to give an alternative Regex solution you could go with something like this...

$pattern = '#'#(?<=href=")(.+?)(?=")#'';
$output = preg_replace_callback($pattern, 'make_absolute', $input);

function make_absolute($link) {
    $domain = 'http://domain.com';
    if(strpos($link[1], 'http')!==0) {
        if(strpos($link[1], '/')!==0) {
            return $domain.'/'.$link[1];
        } else {
            return $domain.$link[1];
        }
    }
    return $link[1];
}

However it is worth noting that with a link such as href="example.html" the link is relative to the current directory neither method shown so far will work correctly for relative links that aren't in the root directory. In order to provide a solution that is though more information would be required about where the information came from.