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HomeBackend DevelopmentPHP Tutorialwordpress源码:get_terms 中 exclude_tree 里的 $taxonomies[0]

get_terms 中 exclude_tree 里的  $taxonomies[0]??为什么不是  $taxonomies??
 @param string|array  $taxonomies Taxonomy name or list of Taxonomy names.
 @type array|string  $exclude           Array or comma/space-separated string of term ids to exclude.
                                          If $include is non-empty, $exclude is ignored.  Default empty array.
   @type array|string  $exclude_tree      Array or comma/space-separated string of term ids to exclude
                                           along with all of their descendant terms. If $include is  non-empty, $exclude_tree is ignored.
                                     Default empty array. 
@type int     $child_of     Term ID to retrieve child terms of. If multiple taxonomies   are passed, $child_of is ignored. Default 0.
  @type bool|int      $hide_empty        Whether to hide terms not assigned to any posts. Accepts
                                           1|true or 0|false. Default 1|true.
function get_terms( $taxonomies, $args = '' )

 $exclusions = array();
        if ( ! empty( $exclude_tree ) ) {
                $exclude_tree = wp_parse_id_list( $exclude_tree );
                $excluded_children = $exclude_tree;
                foreach ( $exclude_tree as $extrunk ) {
                        $excluded_children = array_merge(
                                $excluded_children,
                                (array) get_terms(  $taxonomies[0], array( 'child_of' => intval( $extrunk ), 'fields' => 'ids', 'hide_empty' => 0 ) )
                        );                        //为什么这里不是 $taxonomies??
                }
                $exclusions = array_merge( $excluded_children, $exclusions );
        }

        if ( ! empty( $exclude ) ) {
                $exclusions = array_merge( wp_parse_id_list( $exclude ), $exclusions );
        }


回复讨论(解决方案)


   $taxonomy_objects = get_object_taxonomies( 'post', 'objects' );
   print_r( $taxonomy_objects);

?>
will output
Array
(
    [category] => stdClass Object
        (
            [hierarchical] => 1
            [update_count_callback] => 
            [rewrite] => 
            [query_var] => category_name
            [public] => 1
            [show_ui] => 1
            [show_tagcloud] => 1
            [_builtin] => 1
            [labels] => stdClass Object
                (
                    ...
                )

            ...

            [name] => category
            [label] => Categories
        )

    [post_tag] => stdClass Object
        (
            ...
        )

    [post_format] => stdClass Object
        (
            ....
        )

)

由上可 $taxonomies[0]

由上可看出, $taxonomies[0] = category 
我们知道,post_tag 没有 parent 属性。这种方法 是针对 ! empty( $exclude_tree ) 的,是对 category 而言的。
编码者直接这样调用 category ,虽没有问题,但我想,是存在 bug 的,是存在隐患的。
不知高手如何看这问题。

@param string|array $taxonomies Taxonomy name or list of Taxonomy names 分类名称或分类名称列表
由此可知 $taxonomies 是字符串或数组

不加判断的使用 $taxonomies[0] 是错误的!

版主说得对。在wordpress 手册 http://codex.wordpress.org/Function_Reference/get_terms 
所举例子中:
// no default values. using these as examples
$taxonomies = array( 
    'post_tag',
    'my_tax',
);

$args = array(
    'orderby'           => 'name', 
    'order'             => 'ASC',
    'hide_empty'        => true, 
    'exclude'           => array(), 
    'exclude_tree'      => array(), 
    'include'           => array(),
    'number'            => '', 
    'fields'            => 'all', 
    'slug'              => '',
    'parent'            => '',
    'hierarchical'      => true, 
    'child_of'          => 0,
    'childless'         => false,
    'get'               => '', 
    'name__like'        => '',
    'description__like' => '',
    'pad_counts'        => false, 
    'offset'            => '', 
    'search'            => '', 
    'cache_domain'      => 'core'
); 

$terms = get_terms($taxonomies, $args);
?>
 $taxonomies[0] = “post_tag"
----在此例中,get_terms 还能正常使用,是因为它的参数使它避免了出现问题。如果
真存在这个问题的话,还是请高用致函 wordpress 开发组吧

答案在对参数 child_of 的说明:  $child_of     Term ID to retrieve child terms of .If multiple taxonomies  are passed, $child_of is ignored. 
也就是说,数组 $taxonomies 只能有一个元 素。

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