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Wordpress - Set featured image if nothing is selected

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If a post is published without setting a featured image and there is an image attachment, this will select an image from the media library and set it as the featured image.

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  1. function set_featured_image($post_ID){
  2.  
  3. 	if(!has_post_thumbnail($post_ID)){
  4.  
  5. 		$args = array(
  6. 		    'post_parent'    => $post_ID,
  7. 		    'post_type'      => 'attachment',
  8. 		    'numberposts'    => 1,
  9. 		    'post_status'    => null,
  10. 		    'post_mime_type' => 'image',
  11. 		);
  12.  
  13. 		if($image = get_children($args)) {
  14. 			$image = current($image);
  15. 			add_post_meta($post_ID, '_thumbnail_id', $image->ID);
  16. 		}
  17. 	}
  18. }
  19.  
  20. add_action("publish_post", "set_featured_image");

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