我对这个问题很感兴趣，所以我试了一下。未测试，因此建议备份wp_posts 运行前的表（尽管您无论如何都应该这样做！）

如评论中所述，don\'t forget to replace "domain.com" in the regular expression with your own.

require \'wp-load.php\'; // Only needed if *not* a plugin.

function out_with_the_old( $match ) {
    global $links;

    if ( ! isset( $links[ $match[1] ] ) ) { // Cache to save subsequent hits. 
        $links[ $match[1] ] = get_permalink( $match[1] );
        clean_post_cache( $match[1] );
    }

    return $links[ $match[1] ] ? $links[ $match[1] ] : $match[0]; // Just fallback to original URL if new permalink void (for whatever reason).
}

$links = array();
$posts = get_posts(
    array(
        \'posts_per_page\' => -1,
        \'post_status\'    => \'any\',
        \'post_type\'      => \'any\',
        \'fields\'         => \'ids\', // Getting *everything* will most likely hit the memory limit.
    )
);

// Loop over each post & replace all old instances of the permalink with the new one.
foreach ( $posts as $post_id ) {
    $save = array();
    $post = get_post( $post_id );

    foreach ( array( \'post_content\', \'post_excerpt\' ) as $field ) {
        // Replace "domain\\.com" with your domain name, minus "www." (escape dots with a backslash).
        // The regex accommodates for various forms of the same URL, including SSL, no "www" & no index.php.
        $text = preg_replace_callback( "!https?://(?:www\\.)?domain\\.com/(?:index\\.php)?\\?(?:p|post_id)=([0-9]+)!", \'out_with_the_old\', $post->$field );

        if ( $text !== $post->$field )
            $save[ $field ] = $text;
    }

    if ( $save )
        $wpdb->update(
            $wpdb->posts,
            $save,
            array(
                \'ID\' => $post_id,
            ),
            \'%s\',
            \'%d\'
        );

    clean_post_cache( $post ); // Otherwise we might soon hit a memory limit.
}

您可以将其转换为插件，但最便宜、最简单的方法是将其转储到脚本中，通过FTP传输到WordPress所在的目录，然后在浏览器中运行。