WordPress函数wp_set_post_categories()用法 设置一篇文章的分类

描述：

使用代码设置一篇文章的分类

用法：

<?php wp_set_post_categories( $post_ID, $post_categories, $append ) ?>

参数：

$post_ID

(integer) (可选) 文章ID

默认值: 0

$post_categories

(array) (可选) 分类ID

默认值: array

$append

(boolean) (可选) 如果为true，则邮件将附加类别。如果为false，则类别将替换现有类别。

默认值: false

源文件：

/**
* Set categories for a post.
*
* If the post categories parameter is not set, then the default category is
* going used.
*
* @since 2.1.0
*
* @param int $post_ID Optional. The Post ID. Does not default to the ID
* of the global $post. Default 0.
* @param array|int $post_categories Optional. List of categories or ID of category.
* Default empty array.
* @param bool $append If true, don't delete existing categories, just add on.
* If false, replace the categories with the new categories.
* @return array|bool|WP_Error
*/
function wp_set_post_categories( $post_ID = 0, $post_categories = array(), $append = false ) {
$post_ID = (int) $post_ID;
$post_type = get_post_type( $post_ID );
$post_status = get_post_status( $post_ID );
// If $post_categories isn't already an array, make it one:
$post_categories = (array) $post_categories;
if ( empty( $post_categories ) ) {
if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
$post_categories = array( get_option('default_category') );
$append = false;
} else {
$post_categories = array();
}
} elseif ( 1 == count( $post_categories ) && '' == reset( $post_categories ) ) {
return true;
}

return wp_set_post_terms( $post_ID, $post_categories, 'category', $append );
}