Duplicate page headers in GeneratePress Premium.

README.md

Duplicate GeneratePress Page Headers

WordPress Snippet

duplicate-functions.php

<?php

/*
 * Function creates post duplicate as a draft and redirects then to the edit post screen.
 */
function generate_page_header_duplicate() {
	global $wpdb;
	if (! ( isset( $_GET['post']) || isset( $_POST['post'])  || ( isset($_REQUEST['action']) && 'generate_page_header_duplicate' == $_REQUEST['action'] ) ) ) {
		wp_die('No page header to duplicate has been supplied!');
	}

	/*
	 * Nonce verification.
	 */
	if ( !isset( $_GET['duplicate_nonce'] ) || !wp_verify_nonce( $_GET['duplicate_nonce'], basename( __FILE__ ) ) )
		return;

	/*
	 * Get the original post id.
	 */
	$post_id = (isset($_GET['post']) ? absint( $_GET['post'] ) : absint( $_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;
				if( $meta_key == '_wp_old_slug' ) continue;
				$meta_value = addslashes($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('Header creation failed, could not find original post: ' . $post_id);
	}
}
add_action( 'admin_action_generate_page_header_duplicate', 'generate_page_header_duplicate' );

/*
 * Add the duplicate link to action list for post_row_actions.
 */
function generate_page_header_duplicate_post_link( $actions, $post ) {
	if ($post->post_type=='generate_page_header' && current_user_can('edit_posts')) {
		$actions['duplicate'] = '<a href="' . wp_nonce_url('admin.php?action=generate_page_header_duplicate&post=' . $post->ID, basename(__FILE__), 'duplicate_nonce' ) . '" title="Duplicate this Page Header" rel="permalink">Duplicate</a>';
	}
	return $actions;
}

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