这可能会适得其反，如果时间失控或完全刺穿轮胎，如果你跑过一层钉子，这将使你的车一事无成。在这里，我们需要考虑一些其他方面，西红柿或自行车可以被标记为1967 Ford Mustang Shelby GT500, 或者品牌将是野马谢尔比GT500和福特，我们不希望这样。

因此，让我们看看这里的计划，以避免上述愚蠢的事情

获取分配给职位的术语（汽车）

确定所有术语的顶级术语是否为Make，就所有目的而言，它将是ID为27的术语

我们需要确定post术语在何处适合层次结构，即术语是子术语还是子术语。为了避免任何其他更深层次的问题，我们将只关注儿童和孙子

一旦我们确定

任何一个学期后的顶级家长都是27岁

而且这个词是指孩子或孙子

然后我们可以根据您的需要输出我们的条款

让我们看看我们将如何做到这一点：(NOTE: 该代码没有经过全面测试，至少需要PHP 5.4。为便于理解，对所有代码进行了注释

您首先需要了解，一篇帖子（post或car）只能有一个孩子和一个孙子学期。如果有更多，将使用最后一个孩子和孙子

function get_car_info( $taxonomy = \'product_cat\', $top_level_parent = 27 )
{
    // Make sure that we have a valid taxonomy before we start. If not, return false
    $taxonomy = filter_var( $taxonomy, FILTER_SANITIZE_STRING );
    if ( !taxonomy_exists( $taxonomy ) )
        return false;

    // Make sure our $top_level_parent is 27, if not, validate int value
    if ( 27 !== $top_level_parent )
        $top_level_parent = filter_var( $top_level_parent, FILTER_VALIDATE_INT );

    // Now that everything is safe and sanitized/validated, lets get the current post
    global $post;

    // Now we need to get the terms attached to the post (or car)
    $terms = get_the_terms( $post->ID, $taxonomy );
    /**
     * Make sure we actually have terms, if not, return false
     * Just a note, we already made sure the taxonomy is valid, so $terms should never
     * return a WP_Error object
     */
    if ( !$terms )
        return false;

    // Great, we have terms, now the real work starts
    // Set our variables which will store our brand and model
    $brand = \'\';
    $model = \'\';

    // We need to loop through the array of terms ...
    foreach ( $terms as $term ) {
        // ...check if the term is not top level, if so, skip the term
        if ( 0 == $term->parent )
            continue;

        /**
         * Check if the term parent is equal to $top_level_parent, if so, the term is
         * a direct child term, which mean it is the brand, so lets set $brand
         */
        if ( $term->parent == $top_level_parent ) {
            $brand = $term->name; // Adjust as needed, this output the name
            continue; // Lets move on and avoid any unnecessary work
        }

        /**
         * We have reached this point, so our term is not a top level parent or a 
         * direct child from the top level term. This term is a grandchild or even a 
         * lower level child. We now need to know where in the hierarchy this term fits in
         */
        $term_ancestor = get_ancestors( $term->term_id, $taxonomy );
        // Make sure this is a true grandchild, $term_ancestor should only have two values
        if ( 2 != count( $term_ancestor ) )
            continue;

        /**
         * Now that we know the term is a true grandchild, we need to make sure that it
         * is a true grandchild, we actually make sure that it is a grandchild to  $top_level_parent
         */
        if ( $top_level_parent != end( $term_ancestor ) )
            continue;

        /**
         * OK, we have reached the end here, the term is true grandchild of $top_level_parent,
         * so lets set $model
         */
        $model = $term->name;
    } // endforeach $terms

    /**
     * We are nearly done, make sure that we actually have values in $model and $brand
     * before we return any values to avoid silly output
     */
    if (    !$brand
         || !$model
    )
        return false;

    // YEAH!!! We are finally here, lets return our output
    return \'MAKE: \' . $brand . \'</br>MODEL: \' . $model;
} 

echo get_car_info();