WordPress.org

<p>The WordPress Importer will import the following content from a WordPress export file:</p>
<ul>
<li>Posts, pages and other custom post types</li>
<li>Comments and comment meta</li>
<li>Custom fields and post meta</li>
<li>Categories, tags and terms from custom taxonomies and term meta</li>
<li>Authors</li>
</ul>
<p>For further information and instructions please see the <a href="https://wordpress.org/support/article/importing-content/#wordpress" rel="ugc">documention on Importing Content</a>.</p>
<h3>Filters</h3>
<p>The importer has a couple of filters to allow you to completely enable/block certain features:</p>
<ul>
<li><code>import_allow_create_users</code>: return false if you only want to allow mapping to existing users</li>
<li><code>import_allow_fetch_attachments</code>: return false if you do not wish to allow importing and downloading of attachments</li>
<li><code>import_attachment_size_limit</code>: return an integer value for the maximum file size in bytes to save (default is 0, which is unlimited)</li>
</ul>
<p>There are also a few actions available to hook into:</p>
<ul>
<li><code>import_start</code>: occurs after the export file has been uploaded and author import settings have been chosen</li>
<li><code>import_end</code>: called after the last output from the importer</li>
</ul>


WordPress Importer


Good for the main use cases: restore from backup, and moving posts between blogs. Unfortunately the image import doesn't seem to work (WordPress 6.3 with plugin 0.8.1), which makes it a pain to clean up image-heavy posts.



One thing I'd like to do with this that I can't is to import another copy of a cross-post and merge the comment threads. As it is, the best I can do is import the duplicate copy and then use another plugin (or dig into the database) to move the comments around.


Works well for moving posts between blogs.

Import posts, pages, comments, custom fields, categories, tags and more from a WordPress export file.

Sergey Biryukov

Samuel Wood (Otto)

Ryan McCue

Workshopshed

<p>The Blogger Importer imports your blog data from a Google Blogger site into a WordPress.org installation.</p>
<h4>Items imported</h4>
<ul>
<li>Categories</li>
<li>Posts (published, scheduled and draft)</li>
<li>Comments (not spam)</li>
<li>Images</li>
</ul>
<h4>Items not imported</h4>
<ul>
<li>Pages</li>
<li>Widgets/Widget Data</li>
<li>Templates/Theme</li>
<li>Comment and author Avatars</li>
</ul>
<h3>Reference</h3>
<ul>
<li>https://www.simplepie.org/</li>
</ul>
<p>The following were referenced for implementing the images and links</p>
<ul>
<li>https://wordpress.org/plugins/remote-images-grabber/</li>
<li>http://notions.okuda.ca/wordpress-plugins/blogger-image-import/</li>
<li>https://wordpress.org/plugins/cache-images/</li>
<li>https://wordpress.org/plugins/tumblr-importer/</li>
<li>https://core.trac.wordpress.org/ticket/14525</li>
<li>https://wpengineer.com/1735/easier-better-solutions-to-get-pictures-on-your-posts/</li>
<li>https://web.archive.org/web/20211121020918/http://www.velvetblues.com/web-development-blog/wordpress-plugin-update-urls/</li>
<li>http://wordpress.stackexchange.com/questions//media-sideload-image-file-name (not working)</li>
<li>https://code.tutsplus.com/a-guide-to-the-wordpress-http-api-the-basics–wp-25125t</li>
</ul>
<h3>Known Issues</h3>
<ul>
<li>Some users have reported that their IFrames are stripped out of the post content.</li>
<li>Requests for better performance of larger transfers and tranfers of images</li>
<li>Review of behavior when it re-imports, partiularly are the counts correct</li>
<li>Review using get_posts or get_comments with the appropriate parameters to get the counts and exists instead of using SQL</li>
<li>Incorrect notice, PHP Notice: The data could not be converted to UTF-8. You MUST have either the iconv or mbstring extension installed. This occurs even when Iconv is installed, could be related to Blogger reporting 0 comments</li>
<li>When the importer is running it’s not possible to stop it using the stop button</li>
<li>Blogger’s count of comments include those not linked to a post e.g. the post has been deleted.</li>
</ul>
<h3>Filters and Actions</h3>
<p>These actions and filters have been added so that you can extend the functionality of the importer without needing to modify the code.</p>
<p>Action – import_start – This is run when the import starts processing the records for a new blog</p>
<p>Action – import_done – This is run when the import finishes processing the records for a blog.</p>
<p>Filter – blogger_importer_congrats – Passes the list of options shown to the user when the blog is complete, options can be added or removed.</p>


Blogger Importer

Running the Blogger Importer in PHP 7 throws the following warning:

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; Blogger_Importer has a deprecated constructor in /xxxxxx/wp-content/plugins/blogger-importer/blogger-importer.php on line 44

Another user reported this months ago, but it's not fixed yet.

Deprecated constructor warning

Imports posts, images, comments, and categories (blogger tags) from a Blogger blog then migrates authors to WordPress users.

WordPress Importer vs Blogger Importer