试试这个：

/*
Plugin Name: Post Bulk Update
Description: Updates certain fields of my posts at once. On Activation. Awesome
Author: Me. I did it
*/
add_action(\'init\',\'post_bulk_update\');

function post_bulk_update(){
 $posts_to_update = new WP_Query(\'cat=x&showposts=1000\');
while($posts_to_update ->have_posts()) : $posts_to_update ->the_post();
$postUpdateArray = array();
$postUpdateArray [\'ID\'] = $post->ID;//Don\'t remove this. The ID is mandatory
$postUpdateArray [\'post_title\'] = \'Post Prefix: \'.$post->post_title;
     wp_update_post( $postUpdateArray );
endwhile;

}