add_action( 'admin_notices', function() {
$args = [
'numberposts' => -1,
'post_status' => 'publish',
'post_type' => 'post',
];
$posts = get_posts( $args );
foreach( $posts as $post ) {
$image_id = get_field( 'big_image', $post->ID );
printf( '[%s] ', $image_id );
set_post_thumbnail( $post->ID, $image_id );
}
} );Move a custom field to featured image for blog
Copies a custom field, in this example `big_image`, to the post’s featured image. Uses Advanced Custom Fields (plugin) function to get the custom field. Set as a Run Once code snippet.
Instructions for Move a custom field to featured image for blog
- Log into a staging or locally hosted clone of your site.
- Install and activate Code Snippets plugin.
- WP Admin > Snippets > Add New
- Copy and paste the code from the section above.
- Check to ensure formatting came over properly.
- Customize the code as desired.
- Add a meaningful title.
- Select whether to run on front-end or back-end (or both).
- Click “Save and Activate”.
- Test your site to ensure it works.
- Disable if any problems, or recover.
- Repeat for live environment.
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License
All code snippets are licensed GPLv2 (or later) matching WordPress licensing.
Except when otherwise stated in writing the copyright holders and/or other parties provide the program as-is without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
Disclaimer of warranty
