setKeyAttribute example

    public function testMappedAttributeKeyIsRemoved()
    {
        $node = new PrototypedArrayNode('root');
        $node->setKeyAttribute('id', true);

        // each item under the root is an array, with one scalar item         $prototype = new ArrayNode(null, $node);
        $prototype->addChild(new ScalarNode('foo'));
        $node->setPrototype($prototype);

        $children = [];
        $children[] = ['id' => 'item_name', 'foo' => 'bar'];
        $normalized = $node->normalize($children);

        $expected = [];
        

foreach ($this->children as $child) {
                $child->parent = $node;
                $node->addChild($child->getNode());
            }
        } else {
            $node = new PrototypedArrayNode($this->name, $this->parent, $this->pathSeparator);

            $this->validatePrototypeNode($node);

            if (null !== $this->key) {
                $node->setKeyAttribute($this->key, $this->removeKeyItem);
            }

            if (true === $this->atLeastOne || false === $this->allowEmptyValue) {
                $node->setMinNumberOfElements(1);
            }

            if ($this->default) {
                if (!\is_array($this->defaultValue)) {
                    throw new \InvalidArgumentException(sprintf('%s: the default value of an array node has to be an array.', $node->getPath()));
                }