WordPress函数wp_set_post_terms()用法 设置文章的分类

描述：

通过代码设置文章的分类

用法：

<?php wp_set_post_terms( $post_id, $terms, $taxonomy, $append ) ?>

参数：

$post_id

(integer) (必填) 文章ID.

默认值: 0

$terms

(string,array) (可选) 分类列表。可以是数组或逗号分隔的字符串。如果要输入与类别类似的层次分类法的术语，请使用id。如果要添加非层次术语（如标记），请使用名称。

默认值: array

$taxonomy

(string) (可选) 可能的值，例如：“category”、“post_tag”、“taxonomy slug”

默认值: post_tag

$append

(boolean) (可选) 如果为true，则标记将附加到帖子中。如果为false，标签将替换现有的标签。

默认值: false

源文件：

/**
* Set the terms for a post.
*
* @since 2.8.0
*
* @see wp_set_object_terms()
*
* @param int $post_id Optional. The Post ID. Does not default to the ID of the global $post.
* @param string $tags Optional. The tags to set for the post, separated by commas. Default empty.
* @param string $taxonomy Optional. Taxonomy name. Default 'post_tag'.
* @param bool $append Optional. If true, don't delete existing tags, just add on. If false,
* replace the tags with the new tags. Default false.
* @return array|false|WP_Error Array of affected term IDs. WP_Error or false on failure.
*/
function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $append = false ) {
$post_id = (int) $post_id;

if ( !$post_id )
return false;

if ( empty($tags) )
$tags = array();

if ( ! is_array( $tags ) ) {
$comma = _x( ',', 'tag delimiter' );
if ( ',' !== $comma )
$tags = str_replace( $comma, ',', $tags );
$tags = explode( ',', trim( $tags, "

x0B," ) );
}

/*
* Hierarchical taxonomies must always pass IDs rather than names so that
* children with the same names but different parents aren't confused.
*/
if ( is_taxonomy_hierarchical( $taxonomy ) ) {
$tags = array_unique( array_map( 'intval', $tags ) );
}

return wp_set_object_terms( $post_id, $tags, $taxonomy, $append );
}