如何从查询的对象中获取分类术语名称

Question

So I'm trying to achieve the following.

My code so far..

add_filter('wpseo_title', 'vehicle_listing_title');
function vehicle_listing_title( $title ) 
{
  if ( get_post_type() == 'vehicles' )
  {
    $location = get_the_terms($post->ID, 'vehicle_location');
    $model = get_the_terms($post->ID, 'vehicle_model');
    $title = $model . 'used cars for sale in' . $location .'on'. get_bloginfo('name');
  }
  return $title;
}

1. This code results in $location & $model being an object containing the following term_id =>,name=>,slug=>,term_group=>,etc so I want to get the name part of it.
   How do I do that?

2. What do I have to add to the code to still return the modified $title even when there aren't any posts assigned to the queried taxonomies?

Answer 1

Change your code to this:

add_filter('wpseo_title', 'vehicle_listing_title');

function vehicle_listing_title( $title ) 
{
  if ( get_post_type() == 'vehicles' )
  {
    $location = get_the_terms($post->ID, 'vehicle_location');
    $model = get_the_terms($post->ID, 'vehicle_model');
    $title = '';

    if($model && $model[0]) $title .= $model[0]->name . ' used';
    else $title .= 'Used';

    $title .= ' cars for sale';

    if($location && $location[0]) $title .= ' in ' . $location[0]->name;

    $title .= ' on ' . get_bloginfo('name');

    return $title;
  }

  return $title;
}

Basically, you need to construct your title using IF's to check if the terms array could be obtained for the model and the location. Also, wp_terms() returns an array of term arrays, hence why you also need to obtain the first element of the result using a [0] index, and then chaining the ['name'] index to get the name of the term.