纯代码增加一键复制文章和页面功能

/*
 * 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!');
}
/*
 * 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('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="' . wp_nonce_url('admin.php?action=rd_duplicate_post_as_draft&post=' . $post->ID, basename(__FILE__), 'duplicate_nonce' ) . '" title="Duplicate this item" rel="permalink">Duplicate</a>';
}
return $actions;
}
add_filter( 'post_row_actions', 'rd_duplicate_post_link', 10, 2 );