Online PHP editor | output for D0GfX

@ 2016-12-06T14:56:07Z

<?php
error_reporting(-1);
header('Content-Type: text/plain; charset="utf-8"');


class NodeIterator extends \RecursiveArrayIterator
{
    /**
     * @inheritdoc
     */
    public function hasChildren()
    {
        return $this->current()->hasChildren();
    }

    /**
     * @inheritdoc
     */
    public function getChildren()
    {
        return new NodeIterator($this->current()->getChildren());
    }
}


class Node implements \JsonSerializable, \IteratorAggregate
{
    /**
     * @var mixed
     */
    private $data;

    /**
     * @var Node[]
     */
    private $children = [];

    /**
     * Node constructor.
     *
     * @param mixed $data
     */
    public function __construct($data)
    {
        $this->data = $data;
    }

    /**
     * @return mixed
     */
    public function getData()
    {
        return $this->data;
    }

    /**
     * @return bool
     */
    public function hasChildren()
    {
        return count($this->children) > 0;
    }

    /**
     * @return \RecursiveArrayIterator
     */
    public function getChildren()
    {
        return new \RecursiveArrayIterator($this->children);
    }

    /**
     * @param Node $child
     *
     * @return Node
     */
    public function addChild(self $child)
    {
        if (in_array($child, $this->children, true)) {
            throw new \InvalidArgumentException('duplicate');
        }

        $this->children[] = $child;

        return $child;
    }

    /**
     * @inheritdoc
     */
    public function jsonSerialize()
    {
        return [
            'data' => $this->data,
            'children' => $this->children
        ];
    }

    /**
     * @inheritdoc
     */
    public function getIterator()
    {
        return new NodeIterator([$this]);
    }
}

$root = new Node('root');
$root->addChild(new Node('sub1'))->addChild(new Node('sub1.1'));
$root->addChild(new Node('sub2'))->addChild(new Node('sub2.1'))->addChild(new Node('sub.2.1.1'));
$root->addChild(new Node('sub3'));

print_r(json_encode($root, JSON_PRETTY_PRINT));
echo "\n\n";

foreach ($it = new RecursiveIteratorIterator(new NodeIterator([$root]), RecursiveIteratorIterator::SELF_FIRST) as $node) {
    echo str_repeat('.', $it->getDepth()), $node->getData(), "\n";
}

echo "\n\n";

foreach ($it = new RecursiveIteratorIterator($root, RecursiveIteratorIterator::SELF_FIRST) as $node) {
    echo str_repeat('.', $it->getDepth()), $node->getData(), "\n";
}

Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.13: Deprecated: Return type of NodeIterator::hasChildren() should either be compatible with RecursiveArrayIterator::hasChildren(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/D0GfX on line 11 Deprecated: Return type of NodeIterator::getChildren() should either be compatible with RecursiveArrayIterator::getChildren(): ?RecursiveArrayIterator, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/D0GfX on line 19 Warning: Cannot modify header information - headers already sent by (output started at /in/D0GfX:6) in /in/D0GfX on line 3 Deprecated: Return type of Node::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/D0GfX on line 91 Deprecated: Return type of Node::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/D0GfX on line 102 { "data": "root", "children": [ { "data": "sub1", "children": [ { "data": "sub1.1", "children": [] } ] }, { "data": "sub2", "children": [ { "data": "sub2.1", "children": [ { "data": "sub.2.1.1", "children": [] } ] } ] }, { "data": "sub3", "children": [] } ] } root .sub1 ..sub1.1 .sub2 ..sub2.1 ...sub.2.1.1 .sub3 root .sub1 ..sub1.1 .sub2 ..sub2.1 ...sub.2.1.1 .sub3
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30: { "data": "root", "children": [ { "data": "sub1", "children": [ { "data": "sub1.1", "children": [] } ] }, { "data": "sub2", "children": [ { "data": "sub2.1", "children": [ { "data": "sub.2.1.1", "children": [] } ] } ] }, { "data": "sub3", "children": [] } ] } root .sub1 ..sub1.1 .sub2 ..sub2.1 ...sub.2.1.1 .sub3 root .sub1 ..sub1.1 .sub2 ..sub2.1 ...sub.2.1.1 .sub3
Output for 5.3.10: Parse error: syntax error, unexpected '[' in /in/D0GfX on line 36
Process exited with code 255.

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