mongo-php-driver/docs/api/MongoDB/GeneratedId.php

<?php

namespace MongoDB;

/**
 * Value object for a document identifier that was generated by the driver or
 * server during an insert or upsert operation, respectively.
 */
final class GeneratedId
{
    private $id;
    private $index;

    /**
     * Constructs a new GeneratedId
     *
     * @param mixed   $id    Document identifier
     * @param integer $index Batch index of the corresponding operation
     */
    public function __construct($id, $index)
    {
        $this->id = $id;
        $this->index = (integer) $index;
    }

    /**
     * Returns the GeneratedId
     *
     * @return mixed Document identifier
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Returns the batch index
     *
     * @return integer Batch index of the corresponding operation
     */
    public function getIndex()
    {
        return $this->index;
    }
}