wp-includes/post.php:8221Adds a trashed suffix for a given post.
$postWP_Poststringfunction wp_add_trashed_suffix_to_post_name_for_post( $post ) { global $wpdb; $post = get_post( $post ); if ( str_ends_with( $post->post_name, '__trashed' ) ) { return $post->post_name; } add_post_meta( $post->ID, '_wp_desired_post_slug', $post->post_name ); $post_name = _truncate_post_slug( $post->post_name, 191 ) . '__trashed'; $wpdb->update( $wpdb->posts, array( 'post_name' => $post_name ), array( 'ID' => $post->ID ) ); clean_post_cache( $post->ID ); return $post_name;}Introduced in 4.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/post.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.