public ImmutableConfig::set($key, $value)
Sets a value in this configuration object.
string $key: Identifier to store value in configuration.
mixed $value: Value to associate with identifier.
$this The configuration object.
\Drupal\Core\Config\ConfigValueException If $value is an array and any of its keys in any depth contains a dot.
Overrides Config::set
public function set($key, $value) { throw new ImmutableConfigException("Can not set values on immutable configuration {$this->getName()}:$key. 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::set/8.1.x