How to Duplicate Posts and Pages Without Plugins
It is very useful when you work with a lot of similar posts. So, when you copy a post, you don’t have to enter all metadata, taxonomies etc. each time manually.
This is a example:
Add this to function or create a new file(.php)
new aios_duplicate_post();
class aios_duplicate_post {
function __construct() {
add_action( 'init', array( $this, 'aios_duplicate_content' ) );
add_filter( 'post_row_actions', array( $this, 'aios_duplicate_button' ), 10, 2 );
add_filter( 'page_row_actions', array( $this, 'aios_duplicate_button' ), 10, 2 );
}
/*
* Function creates post duplicate as a draft and redirects then to the edit post screen
*/
function aios_duplicate_content() {
if( isset( $_GET['do_action'] ) && $_GET['do_action'] == 'aios_duplicate_content' && isset( $_GET['nonce'] ) ) {
// Nonce verification
wp_verify_nonce( $_GET['nonce'], 'aios_duplicate_content_nonce' . $_REQUEST['post_id'] );
// Get the original post id
$page_id = $_GET['post_id'];
// and all the original post data then
$page_object = get_post( $page_id );
$taxonomies = get_object_taxonomies( $page_object->post_type );
$post_meta_data = get_post_meta( $page_id );
if( $page_object ) {
// new post data array
$new_page_title = $page_object->post_title . ' - Clone';
$new_page_url = $page_object->post_name . '-clone';
$new_page_author = $page_object->post_author;
$new_page_content = $page_object->post_content;
$new_page_image_id = get_post_thumbnail_id( $page_id );
// Create post object
$my_post = array(
'post_title' => $new_page_title,
'post_content' => $new_page_content,
'post_type' => $page_object->post_type,
'post_status' => 'draft',
'post_author' => $new_page_author,
'post_name' => $new_page_url
);
// Insert the post into the database
$new_post = wp_insert_post( $my_post );
if( $new_post ) {
// Loop over returned taxonomies, and re-assign them to the new post_type
if( $taxonomies ) {
foreach( $taxonomies as $taxonomy ) {
$terms = wp_get_post_terms( $page_id, $taxonomy );
if( $terms ) {
$assigned_terms = array();
foreach( $terms as $assigned_term ) {
$assigned_terms[] = $assigned_term->term_id;
}
wp_set_object_terms( $new_post, $assigned_terms, $taxonomy, false );
}
}
}
// Loop over returned metadata, and re-assign them to the new post_type
if( $post_meta_data ) {
foreach( $post_meta_data as $meta_data => $value ) {
if( is_array( $value ) ) {
foreach( $value as $meta_value => $meta_text ) {
/*
* Check for serialized data in some meta field
* The varialble pricing field is a serialized array
*/
if( is_serialized( $meta_text ) ) {
update_post_meta( $new_post, $meta_data, unserialize( $meta_text ) );
} else {
update_post_meta( $new_post, $meta_data, $meta_text );
}
}
} else {
update_post_meta( $new_post, $meta_data, $value );
}
}
}
// re-assign the featured image
if( $new_page_image_id ) {
set_post_thumbnail( $new_post, $new_page_image_id );
}
wp_redirect( esc_url_raw( admin_url( 'post.php?action=edit&post=' . $new_post ) ) );
exit();
}
}
}
}
/*
* Add the duplicate link to action list for post_row_actions
*/
function aios_duplicate_button( $actions, $post ) {
// Verify if user can edit_posts
if ( !current_user_can('edit_posts') ) return;
global $post;
// Check post_type
if ( get_current_screen()->post_type === 'post' || get_current_screen()->post_type === 'page' ) {
$post_type_labels = get_post_type_object( $post->post_type );
$duplicate_url = add_query_arg(
array(
'do_action' => 'aios_duplicate_content',
'nonce' => wp_create_nonce( 'aios_duplicate_content_nonce' . $post->ID ),
'post_id' => $post->ID
),
esc_url( admin_url( 'edit.php?post_type=' . get_current_screen()->post_type ) )
);
$actions['aios_duplicate_content'] = '<a href="' . $duplicate_url . '" target="_blank">Duplicate</a>';
return $actions;
}
}
}