public AliasStorageInterface::aliasExists($alias, $langcode, $source = NULL)
Checks if alias already exists.
The default implementation performs case-insensitive matching on the 'source' and 'alias' strings.
string $alias: Alias to check against.
string $langcode: Language of the alias.
string|null $source: (optional) Path that alias is to be assigned to.
bool TRUE if alias already exists and FALSE otherwise.
public function aliasExists($alias, $langcode, $source = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Path!AliasStorageInterface.php/function/AliasStorageInterface::aliasExists/8.1.x