Duplicate Post/Page Link

// Add duplicate button to post/page list of actions.

add_filter( 'post_row_actions', 'wpcode_snippet_duplicate_post_link', 10, 2 );

add_filter( 'page_row_actions', 'wpcode_snippet_duplicate_post_link', 10, 2 );

// Let's make sure the function doesn't already exist.

if ( ! function_exists( 'wpcode_snippet_duplicate_post_link' ) ) {

	/**

	 * @param array   $actions The actions added as links to the admin.

	 * @param WP_Post $post The post object.

	 *

	 * @return array

	 */

	function wpcode_snippet_duplicate_post_link( $actions, $post ) {

		// Don't add action if the current user can't create posts of this post type.

		$post_type_object = get_post_type_object( $post->post_type );

		if ( null === $post_type_object || ! current_user_can( $post_type_object->cap->create_posts ) ) {

			return $actions;

		}

		$url = wp_nonce_url(

			add_query_arg(

				array(

					'action'  => 'wpcode_snippet_duplicate_post',

					'post_id' => $post->ID,

				),

				'admin.php'

			),

			'wpcode_duplicate_post_' . $post->ID,

			'wpcode_duplicate_nonce'

		);

		$actions['wpcode_duplicate'] = '<a href="' . $url . '" title="Duplicate item" rel="permalink">Duplicate</a>';

		return $actions;

	}

}

/**

 * Handle the custom action when clicking the button we added above.

 */

add_action( 'admin_action_wpcode_snippet_duplicate_post', function () {

	if ( empty( $_GET['post_id'] ) ) {

		wp_die( 'No post id set for the duplicate action.' );

	}

	$post_id = absint( $_GET['post_id'] );

	// Check the nonce specific to the post we are duplicating.

	if ( ! isset( $_GET['wpcode_duplicate_nonce'] ) || ! wp_verify_nonce( $_GET['wpcode_duplicate_nonce'], 'wpcode_duplicate_post_' . $post_id ) ) {

		// Display a message if the nonce is invalid, may it expired.

		wp_die( 'The link you followed has expired, please try again.' );

	}

	// Load the post we want to duplicate.

	$post = get_post( $post_id );

	// Create a new post data array from the post loaded.

	if ( $post ) {

		$current_user = wp_get_current_user();

		$new_post     = array(

			'comment_status' => $post->comment_status,

			'menu_order'     => $post->menu_order,

			'ping_status'    => $post->ping_status,

			'post_author'    => $current_user->ID,

			'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 . ' (copy)',// Add "(copy)" to the title.

			'post_type'      => $post->post_type,

			'to_ping'        => $post->to_ping,

		);

		// Create the new post

		$duplicate_id = wp_insert_post( $new_post );

		// Copy the taxonomy terms.

		$taxonomies = get_object_taxonomies( get_post_type( $post ) );

		if ( $taxonomies ) {

			foreach ( $taxonomies as $taxonomy ) {

				$post_terms = wp_get_object_terms( $post_id, $taxonomy, array( 'fields' => 'slugs' ) );

				wp_set_object_terms( $duplicate_id, $post_terms, $taxonomy );

			}

		}

		// Copy all the custom fields.

		$post_meta = get_post_meta( $post_id );

		if ( $post_meta ) {

			foreach ( $post_meta as $meta_key => $meta_values ) {

				if ( '_wp_old_slug' === $meta_key ) { // skip old slug.

					continue;

				}

				foreach ( $meta_values as $meta_value ) {

					add_post_meta( $duplicate_id, $meta_key, maybe_unserialize( $meta_value ) );

				}

			}

		}

		// Redirect to edit the new post.

		wp_safe_redirect(

			add_query_arg(

				array(

					'action' => 'edit',

					'post'   => $duplicate_id

				),

				admin_url( 'post.php' )

			)

		);

		exit;

	} else {

		wp_die( 'Error loading post for duplication, please try again.' );

	}

} );