public AliasManagerInterface::getPathByAlias($alias, $langcode = NULL)
Given the alias, return the path it represents.
string $alias: An alias.
string $langcode: An optional language code to look up the path in.
string The path represented by alias, or the alias if no path was found.
\InvalidArgumentException Thrown when the path does not start with a slash.
public function getPathByAlias($alias, $langcode = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Path!AliasManagerInterface.php/function/AliasManagerInterface::getPathByAlias/8.1.x