這篇做個紀錄，常常我們想在貼文直接複製一篇來改，但WordPress並沒有這個功能，所以還有人寫了專門的外掛(Duplicate Post Plugin, Duplicator Plugin)，如果有大量新增貼文的需求，這個功能變得重要且必要，如果你搜尋找到這篇文，就表示你懂。
做法
將下面程式碼貼到Code Snippet，存檔並全域執行即可
/*
* Function creates post duplicate as a draft and redirects then to the edit post screen
*/
function rd_duplicate_post_as_draft(){
global $wpdb;
if (! ( isset( $_GET['post']) || isset( $_POST['post']) || ( isset($_REQUEST['action']) && 'rd_duplicate_post_as_draft' == $_REQUEST['action'] ) ) ) {
wp_die('No post to duplicate has been supplied!');
}
/*
* get the original post id
*/
$post_id = (isset($_GET['post']) ? $_GET['post'] : $_POST['post']);
/*
* and all the original post data then
*/
$post = get_post( $post_id );
/*
* if you don't want current user to be the new post author,
* then change next couple of lines to this: $new_post_author = $post->post_author;
*/
$current_user = wp_get_current_user();
$new_post_author = $current_user->ID;
/*
* if post data exists, create the post duplicate
*/
if (isset( $post ) && $post != null) {
/*
* new post data array
*/
$args = array(
'comment_status' => $post->comment_status,
'ping_status' => $post->ping_status,
'post_author' => $new_post_author,
'post_content' => $post->post_content,
'post_excerpt' => $post->post_excerpt,
'post_name' => $post->post_name,
'post_parent' => $post->post_parent,
'post_password' => $post->post_password,
'post_status' => 'draft',
'post_title' => $post->post_title,
'post_type' => $post->post_type,
'to_ping' => $post->to_ping,
'menu_order' => $post->menu_order
);
/*
* insert the post by wp_insert_post() function
*/
$new_post_id = wp_insert_post( $args );
/*
* get all current post terms ad set them to the new post draft
*/
$taxonomies = get_object_taxonomies($post->post_type); // returns array of taxonomy names for post type, ex array("category", "post_tag");
foreach ($taxonomies as $taxonomy) {
$post_terms = wp_get_object_terms($post_id, $taxonomy, array('fields' => 'slugs'));
wp_set_object_terms($new_post_id, $post_terms, $taxonomy, false);
}
/*
* duplicate all post meta just in two SQL queries
*/
$post_meta_infos = $wpdb->get_results("SELECT meta_key, meta_value FROM $wpdb->postmeta WHERE post_id=$post_id");
if (count($post_meta_infos)!=0) {
$sql_query = "INSERT INTO $wpdb->postmeta (post_id, meta_key, meta_value) ";
foreach ($post_meta_infos as $meta_info) {
$meta_key = $meta_info->meta_key;
$meta_value = addslashes($meta_info->meta_value);
$sql_query_sel[]= "SELECT $new_post_id, '$meta_key', '$meta_value'";
}
$sql_query.= implode(" UNION ALL ", $sql_query_sel);
$wpdb->query($sql_query);
}
/*
* finally, redirect to the edit post screen for the new draft
*/
wp_redirect( admin_url( 'post.php?action=edit&post=' . $new_post_id ) );
exit;
} else {
wp_die('Post creation failed, could not find original post: ' . $post_id);
}
}
add_action( 'admin_action_rd_duplicate_post_as_draft', 'rd_duplicate_post_as_draft' );
/*
* Add the duplicate link to action list for post_row_actions
*/
function rd_duplicate_post_link( $actions, $post ) {
if (current_user_can('edit_posts')) {
$actions['duplicate'] = '<a href="admin.php?action=rd_duplicate_post_as_draft&post=' . $post->ID . '" title="Duplicate this item 複製並編輯貼文" rel="permalink">Duplicate複製</a>';
}
return $actions;
}
add_filter( 'post_row_actions', 'rd_duplicate_post_link', 10, 2 );
add_filter( 'page_row_actions', 'rd_duplicate_post_link', 10, 2); /* for pages */
add_filter( 'portfolio_row_actions', 'rd_duplicate_post_link', 10, 2); /* a custom post called portfolio */執行之後，你就能在post、page，甚至是custom post type都能直接複製貼文了，超級方便。
參考資料
https://hookagency.com/blog/add-duplicating-function-to-posts-and-pages-without-a-plugin/
