这就是我的意思：

<?php 
$tochange = get_posts(\'numberposts=-1&post_type=any&category_name=category-name-you-want-to-change\');
foreach($tochange as $post){
    setup_postdata($post);
        $contentchange = \'\'; /*here you do the magic, string replace or whathever you want to do*/
        $tochange = array();
        $tochange[\'ID\'] = $post->ID;
        $tochange[\'post_content\'] = $contentchange;
        $out = wp_update_post($tochange);
        unset($tochange);
    }
wp_reset_query();
?>

<?php 
function update_post_do()
{
global $wpdb;
$wpdb->query("UPDATE wp_posts p
INNER JOIN wp_term_relationships AS tr ON (p.ID = tr.object_id)
INNER JOIN wp_term_taxonomy AS tt ON (tr.term_taxonomy_id = tt.term_taxonomy_id
AND tt.taxonomy = \'your_category\' AND tt.term_id
IN ( 1 )) SET p.post_content = \'your content\'");
}
add_action(\'init\',\'update_post_do\'); 
?>