如何按当前日期查询帖子，并根据帖子标题上的关键字自动分配类别，例如如果标题包含“oranges”，则自动分配“oranges”类别

也许像这样的东西可以用于函数。php

function add_category_automatically($post_ID) {
global $wpdb,$post;

   $today = getdate();
   $query = new WP_Query( \'year=\' . $today["year"] . \'&monthnum=\' . $today["mon"] .\'&day=\' . $today["mday"] );
while ( $the_query->have_posts() ) : $the_query->the_post();

  $post_title = get_the_title();
   if (stripos($post_title, \'oranges\')!==false) {
    $cat = array(8);
    wp_set_object_terms($post_ID, $cat, \'category\');
}
 endwhile;
}
 add_action(\'publish_post\', \'add_category_automatically\');

上面的代码不起作用，虽然下面的代码起作用，但在我再次更新之前，它对现有帖子并不能起作用，所以我需要一个函数来按当前日期查询所有帖子，并且只有在找到今天的新帖子时才应运行该函数

    function add_category_automatically($post_ID) {
global $wpdb,$post;

       $post_title = get_the_title();
     if (stripos($post_title, \'oranges\')!==false) {
    $cat = array(8);
    wp_set_object_terms($post_ID, $cat, \'category\');
  }

     }
      add_action(\'publish_post\', \'add_category_automatically\');

更新时间：

我现在正在使用这段代码，如果我发布了一篇新文章，但对现有的文章不起作用，它就会起作用。。。。。它应该每次运行并检查数据库中的所有帖子，并自动分类帖子，但smhw不是

       add_action( \'wp_insert_post\', \'update_post_terms\' );
       function update_post_terms( $post_id ) {
      if ( $parent = wp_is_post_revision( $post_id ) )
    $post_id = $parent;
   $post = get_post( $post_id );
    if ( $post->post_type != \'post\' )
    return;
     $post_title = get_the_title();
       if (stripos($post_title, \'oranges\')!==false) {

     // add a category
      $categories = wp_get_post_categories( $post_id );
        $newcat    = get_term_by( \'name\', \'oranges\', \'category\' );
        array_push( $categories, $newcat->term_id );
        wp_set_post_categories( $post_id, $categories );
     } 
        }

我知道即使我弄明白了这一点，它也会给我的数据库带来很好的负载，但我正在寻找一种方法来做到这一点，比如每两个小时一个实例，或者类似的，请帮助！

Update 2 to check all posts and loop them to push the category

 $postids = array();
   //this is to tell the script to only pull posts that are labeled "publish"
  $args=array(
     \'post_type\' => \'post\',
      \'post_status\' => \'publish\',
      \'posts_per_page\' => -1,
      \'caller_get_posts\'=> 1
   );
  $my_query = null;
$my_query = new WP_Query($args);
   if ( $my_query->have_posts() ) {
while ($my_query->have_posts()) : $my_query->the_post();
$postids[]=$my_query->post->ID;
endwhile;
 }
 wp_reset_query();  // Restore global post data stomped by the_post().

 $i = 0;

  while ($num_of_posts > $i){
  $post_id = $postids[$i];
  add_action( \'wp_insert_post\', \'update_post_terms\' );
  function update_post_terms( $post_id ) {
  if ( $parent = wp_is_post_revision( $post_id ) )
    $post_id = $parent;
   $post = get_post( $post_id );
  if ( $post->post_type != \'post\' )
    return;
  $post_title = get_the_title();
 if (stripos($post_title, \'oranges\')!==false) {

 // add a category
  $categories = wp_get_post_categories( $post_id );
  $newcat    = get_term_by( \'name\', \'Oranges\', \'category\' );
  array_push( $categories, $newcat->term_id );
  wp_set_post_categories( $post_id, $categories );
 }
 }
  $i++;
 }

$query = new WP_Query( \'post_type=post\' );

<?php wp_schedule_event($timestamp, $recurrence, $hook, $args); ?>