当taxonomy is unavailable/unknown.

在我的情况下，当使用get_term_by, 在某些情况下，只有术语Slug（没有术语ID或分类法）。这让我来到了这里。然而，提供的答案并没有完全解决我的问题。

空的解决方案$taxonomy

// We want to find the ID to this slug.
$term_slug = \'foo-bar\';
$taxonomies = get_taxonomies();
foreach ( $taxonomies as $tax_type_key => $taxonomy ) {
    // If term object is returned, break out of loop. (Returns false if there\'s no object)
    if ( $term_object = get_term_by( \'slug\', $term_slug , $taxonomy ) ) {
        break;
    }
}
$term_id = $term_object->name;

echo \'The Term ID is: \' . $term_id . \'<br>\';
var_dump( $term_object );

结果

The Term ID is: 32
object(WP_Term)
  public \'term_id\' => int 32
  public \'name\' => string \'Example Term\'
  public \'slug\' => string \'example-term\'
  public \'term_group\' => int 0
  public \'term_taxonomy_id\' => int 123
  public \'taxonomy\' => string \'category\'
  public \'description\' => string \'\'
  public \'parent\' => int 0
  public \'count\' => int 23
  public \'filter\' => string \'raw\'

Note: 我试图从术语Slug中搜索相关分类法（ID或Slug），但不幸的是，我在WordPress中找不到任何可用的方法。

谢谢，这对我有用。

我创建了一个函数，并根据需要反复使用它。

function helper_get_taxonomy__by_slug($term_slug){
    $term_object = "";
    $taxonomies = get_taxonomies();
    foreach ($taxonomies as $tax_type_key => $taxonomy) {
        // If term object is returned, break out of loop. (Returns false if there\'s no object);
        if ($term_object = get_term_by(\'slug\', $term_slug, $taxonomy)) {
            break;
        }else{
            $term_object = "Warn! Helper taxonomy not found.";
        }
    }
    return $term_object;
}