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function wpsites_auto_set_featured_image() {
global $post;
$already_has_thumb = has_post_thumbnail($post->ID);
if (!$already_has_thumb) {
$attached_image = get_children( "post_parent=$post->ID&post_type=attachment&post_mime_type=image&numberposts=1" );
if ($attached_image) {
foreach ($attached_image as $attachment_id => $attachment) {
set_post_thumbnail($post->ID, $attachment_id);
}
}
}
}
add_action('the_post', 'wpsites_auto_set_featured_image');
add_action('save_post', 'wpsites_auto_set_featured_image');
add_action('draft_to_publish', 'wpsites_auto_set_featured_image');
add_action('new_to_publish', 'wpsites_auto_set_featured_image');
add_action('pending_to_publish', 'wpsites_auto_set_featured_image');
add_action('future_to_publish', 'wpsites_auto_set_featured_image');
/**
* @author Brad Dalton - WP Sites
*
* @link http://wpsites.net/wordpress-tips/auto-set-featured-image/
*/
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