vendor/sebastian/recursion-context/src/Context.php

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<?php
/*
 * This file is part of the Recursion Context package.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace SebastianBergmann\RecursionContext;

/**
 * A context containing previously processed arrays and objects
 * when recursively processing a value.
 */
final class Context
{
    /**
     * @var array[]
     */
    private $arrays;

    /**
     * @var \SplObjectStorage
     */
    private $objects;

    /**
     * Initialises the context
     */
    public function __construct()
    {
        $this->arrays  = array();
        $this->objects = new \SplObjectStorage;
    }

    /**
     * Adds a value to the context.
     *
     * @param array|object $value The value to add.
     *
     * @return int|string The ID of the stored value, either as a string or integer.
     *
     * @throws InvalidArgumentException Thrown if $value is not an array or object
     */
    public function add(&$value)
    {
        if (is_array($value)) {
            return $this->addArray($value);
        } elseif (is_object($value)) {
            return $this->addObject($value);
        }

        throw new InvalidArgumentException(
            'Only arrays and objects are supported'
        );
    }

    /**