/**
* Turns a URL into a relative path.
*
* The result is a canonical path. This class is using functionality of Path class.
*
* @see Path
*
* @param string $url A URL to make relative.
* @param string $baseUrl A base URL.
*
* @return string
*
* @throws InvalidArgumentException If the URL and base URL does
* not match.
*/
public static function makeRelative($url, $baseUrl)
{
Assert::string($url, 'The URL must be a string. Got: %s');
Assert::string($baseUrl, 'The base URL must be a string. Got: %s');
Assert::contains($baseUrl, '://', '%s is not an absolute Url.');
list($baseHost, $basePath) = self::split($baseUrl);
if (false === strpos($url, '://')) {
if (0 === strpos($url, '/')) {
$host = $baseHost;
} else {
$host = '';
}
$path = $url;
} else {
list($host, $path) = self::split($url);
}
if ('' !== $host && $host !== $baseHost) {
throw new InvalidArgumentException(sprintf('The URL "%s" cannot be made relative to "%s" since their host names are different.', $host, $baseHost));
}
return Path::makeRelative($path, $basePath);
}