public Config::clear($key)
Unsets a value in this configuration object.
string $key: Name of the key whose value should be unset.
$this The configuration object.
Overrides ConfigBase::clear
public function clear($key) { parent::clear($key); $this->resetOverriddenData(); return $this; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!Config.php/function/Config::clear/8.1.x