public ImmutableConfig::clear($key)
Unsets a value in this configuration object.
string $key: Name of the key whose value should be unset.
$this The configuration object.
Overrides Config::clear
public function clear($key) { throw new ImmutableConfigException("Can not clear $key key in immutable configuration {$this->getName()}. Use \\Drupal\\Core\\Config\\ConfigFactoryInterface::getEditable() to retrieve a mutable configuration object"); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!ImmutableConfig.php/function/ImmutableConfig::clear/8.1.x