这很容易实现。你的答案是usort()

几点注意事项：

需要PHP5。4+由于使用了短数组语法([]). 如果您有一个旧版本，您应该真正升级，因为旧版本是一个真正的安全威胁，因为PHP 5.4之前的所有旧版本都已过时

我将在编写过程中对代码进行注释，以便您轻松地理解

分类术语和自定义字段是缓存的，因此您不会进行额外的db调用，因此解决方案仍然非常精简。

下面的代码未经测试，因此请确保先在本地进行测试

代码：

public function automate_posts_to_send()
{
    $value          = get_option( \'email_settings_options\');
    $article_number = $value[\'number_of_articles_to_send\'];

    /**
     * Add the tag ids here in the correct order you need your posts to be in
     * In this example, posts from tag 2 will show first, then posts from tag 3 then tag 1
     * As I said, I\'m using short array syntax, so for older versions of PHP prior to 5.4,
     * [2, 3, 1] would become array( 2, 3, 1 )
     */
    $tag_order = [2, 3, 1]; 
    $args = [ 
        \'tag__in\' => $tag_order,
        //\'orderby\' => $tag_order // This is invalid ordering, add valid value here according to needs
        \'posts_per_page\' => $article_number,
        \'date_query\' => [
            [
                \'after\' => \'24 hours ago\'
            ]
        ],
    ];
    $posts_array = get_posts( $args );

    /**
     * Now we will sort the returned array of posts as we need them according to $tag_order. We will use usort()
     *
     * There is a bug in usort causing the following error:
     * usort(): Array was modified by the user comparison function
     * @see https://bugs.php.net/bug.php?id=50688
     * This bug has yet to be fixed, when, no one knows. The only workaround is to suppress the error reporting
     * by using the @ sign before usort
     */
    @usort( $posts_array, function ( $a, $b ) use ( $tag_order )
    {
        // Store our post ids in an array. We will use that to get our post tags per post
        $array = [
            \'a\' => $a->ID, // Use only post ID
            \'b\' => $b->ID // Same as above
        ];
        // Define our two variables which will hold the desired tag id
        $array_a = [];
        $array_b = [];

        // We will now get and store our post tags according to the tags in $tag_order
        foreach ( $array as $k=>$v ) {
            $tags = get_the_tags( $v );
            if ( $tags ) {
                foreach ( $tags as $tag ) {
                    if ( !in_array( $tag->term_id, $tag_order ) )
                        continue;

                    // If we found a tag that is in the $tag_order array, store it and break the foreach loop
                    ${\'array_\' . $k}[] = $tag->term_id; // Will produce $array_a[] = $tag->term_id or $array_b[] = $tag->term_id

                    // If we found the tag we are looking for, break the foreach loop
                    break;
                } // endforeach $tags
            } // endif $tags
        } // endforeach $array

        // Flip the $tag_order array for sorting purposes
        $flipped_tag_order = array_flip( $tag_order );

        /**
         * Lets sort our array now
         *
         * We will sort according to tag first. If the tags between two posts being compared are the same
         * we will sort the posts by post date. Adjust this as necessary
         */
        if ( $flipped_tag_order[$array_a] != $flipped_tag_order[$array_b] ) {
            return $flipped_tag_order[$array_a] - $flipped_tag_order[$array_b];
        } else {
            return $a->post_date < $b->post_date; // Change to > if you need oldest posts first
        }
    }); // end our usort ordering

    // We are done sorting, etc. Return our $posts_array
    return $posts_array;
}

中的tag\\uu未列为中的有效orderby值the codex.

我建议抓取比您需要的更多的帖子，并在您的PHP中进行排序。

默认情况下，WP不按分类法/标记排序。一种可能的解决方案是执行3个单独的get\\u posts调用，每个标记一个，然后使用array\\u merge将结果合并到一个数组中。