public LockBackendInterface::getLockId()
Gets the unique page token for locks.
Locks will be wiped out at the end of each page request on a token basis.
string
public function getLockId();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Lock!LockBackendInterface.php/function/LockBackendInterface::getLockId/8.1.x