How to set featured image to a post automatically in WordPress

If you are finding a solution to set featured image automatically in WordPress, these following code lines will help you save several minutes.

The action blow only supports setting featured image on updating a post.

The function first check if a post already has featured image. If not, it queries all images uploaded to the post and set the first uploaded image as featured one.

function my_plugin_set_feature($post_id) {
	if (!has_post_thumbnail($post_id))  {
		$attached_images = get_children("post_parent=$post_id&post_type=attachment&post_mime_type=image&numberposts=1" );
		if ($attached_images) {
			foreach ($attached_images as $attachment_id => $attachment) {
				set_post_thumbnail($post_id, $attachment_id);
add_action('save_post', 'my_plugin_set_feature');

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