vendor/guzzle/guzzle/src/Guzzle/Http/EntityBody.php

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<?php

namespace Guzzle\Http;

use Guzzle\Common\Version;
use Guzzle\Stream\Stream;
use Guzzle\Common\Exception\InvalidArgumentException;
use Guzzle\Http\Mimetypes;

/**
 * Entity body used with an HTTP request or response
 */
class EntityBody extends Stream implements EntityBodyInterface
{
    /** @var bool Content-Encoding of the entity body if known */
    protected $contentEncoding = false;

    /** @var callable Method to invoke for rewinding a stream */
    protected $rewindFunction;

    /**
     * Create a new EntityBody based on the input type
     *
     * @param resource|string|EntityBody $resource Entity body data
     * @param int                        $size     Size of the data contained in the resource
     *
     * @return EntityBody
     * @throws InvalidArgumentException if the $resource arg is not a resource or string
     */
    public static function factory($resource = '', $size = null)
    {
        if ($resource instanceof EntityBodyInterface) {
            return $resource;
        }

        switch (gettype($resource)) {
            case 'string':
                return self::fromString($resource);
            case 'resource':
                return new static($resource, $size);
            case 'object':
                if (method_exists($resource, '__toString')) {
                    return self::fromString((string) $resource);
                }
                break;
            case 'array':
                return self::fromString(http_build_query($resource));
        }

        throw new InvalidArgumentException('Invalid resource type');
    }

    public function setRewindFunction($callable)
    {
        if (!is_callable($callable)) {
            throw new InvalidArgumentException('Must specify a callable');
        }

        $this->rewindFunction = $callable;