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add_action('save_post', 'wpds_check_thumbnail');
add_action('admin_notices', 'wpds_thumbnail_error');
If your blog layout is set to display a featured image, it can be useful to prevent post publishing if the post doesn’t have a featured image set.
This code has to be pasted into your functions.php file.
This code has to be pasted into your functions.php file.
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You can use [html][/html], [css][/css], [php][/php] and more to embed the code. Urls are automatically hyperlinked. Line breaks and paragraphs are automatically generated.