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WordPress主题函数get_the_category_by_ID()知识点。

描述：

通过分类id获取分类所有信息

用法：

<?php get_the_category_by_ID( $cat_ID ); ?>

参数：

$cat_ID

(int) (必填) 分类ID

默认值:None

源文件：

/**
 * Retrieve category name based on category ID.
 *
 * @since 0.71
 *
 * @param int $cat_ID Category ID.
 * @return string|WP_Error Category name on success, WP_Error on failure.
 */
function get_the_category_by_ID( $cat_ID ) {
	$cat_ID = (int) $cat_ID;
	$category = get_term( $cat_ID, 'category' );

	if ( is_wp_error( $category ) )
		return $category;

	return ( $category ) ? $category->name : '';
}