public static UrlHelper::isExternal($path) Determines

Provides a way to build external or non Drupal local domain URLs. It takes into account configured safe HTTP protocols.

ProjectInfo::processInfoList(array &$projects, array $list, $project_type

public static Unicode::validateUtf8($text) Checks

Indicates an error during check for PHP unicode support. File core/lib/Drupal/Component/Utility/Unicode

public static Unicode::strtoupper($text) Converts

public LinkGenerator::__construct(UrlGeneratorInterface $url_generator

public LinkGenerator::generateFromLink(Link $link)

The renderer service. Type:

public Token::findWithPrefix(array $tokens, $prefix, $delimiter = ':')