MediaType/ImageMediaType.php
public static function check($data)
    {
        $allowedExtensions = array(
            'png',
            'jpeg',
            'jpg',
            'gif',
            'tiff',
            'svg',
        );

        if (in_array(strtolower(pathinfo($data, PATHINFO_EXTENSION)), $allowedExtensions)) {
            return new self($data);
        } else {
            return;
        }
    }
public static function check($data)
    {
        $allowedExtensions = array(
            'png',
            'jpeg',
            'jpg',
            'gif',
            'tiff',
            'svg',
        );

        if (in_array(strtolower(pathinfo($data, PATHINFO_EXTENSION)), $allowedExtensions)) {
            return new self($data);
        } else {
            return;
        }
    }
@TODO: implement extra file object check

@param $data

@return ImageMediaType|null