尝试将其放入函数中。主题的php。在这种形式下它没有经过测试，但应该可以工作。

/**
 * Change the Permalink on save / update
 */
function wpse_297006_rewrite_slug( $post_id, $post, $update ){
  // check if it\'s a post
  if (!(get_post_type( $post_id ) === \'post\')) return;
  // check if it\'s not a revision
  if (!(wp_is_post_revision( $post_id ) === false)) return;

  // check if it\'s not a revision
  $content = get_post_field(\'post_content\', $post_id);
  // set the args
  $args = [
    \'ID\' => $post_id,
    \'post_name\' => strtolower( sanitize_title( $content ) ),
  ];

  // unhook this method to prevent infinite loop
  remove_action(\'wp_insert_post\', \'wpse_297006_rewrite_slug\');
  // apply $args when post is saved
  wp_update_post( $args );
  // re-hook this method
  add_action(\'wp_insert_post\', \'wpse_297006_rewrite_slug\', 10, 3);
};

add_action(\'wp_insert_post\', \'wpse_297006_rewrite_slug\', 10, 3);