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Plugin API/Action Reference/trash post

Run actions when a post, page, or custom post type is about to be trashed. The post ID is passed to the action hook.



(integer) (required) The ID of the post, page, or custom post type being deleted.
Default: None

 add_action( 'trash_post', 'function_to_run_on_post_trash' );
 function function_to_run_on_post_trash( $post_id ) {
   // trash a related post or fire notice

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