src/DependencyInjection/Configuration.php
protected function build(ArrayNodeDefinition $rootNode): void
    {
        $rootNode
            ->children()
                ->integerNode('max_items')->defaultValue(20)->info('How much for max items')->end()
        ;
    }
protected function build(ArrayNodeDefinition $rootNode): void
    {
        $rootNode
            ->children()
                ->integerNode('max_items')->defaultValue(20)->info('How much for max items')->end()
        ;
    }
protected function build ( ArrayNodeDefinition $ rootNode ) : void { $ rootNode -> children ( ) -> integerNode ( 'max_items' ) -> defaultValue ( 20 ) -> info ( 'How much for max items' ) -> end ( ) ; }
Build the config tree.

@param ArrayNodeDefinition $rootNode
Build the config tree .