is_category()判断是否分类页

<?php
if(is_category()){
    echo "我只会在分类页显示";
}
?>

/**
 * Is the query for an existing category archive page?
 *
 * If the $category parameter is specified, this function will additionally
 * check if the query is for one of the categories specified.
 *
 * @since 1.5.0
 *
 * @global WP_Query $wp_query Global WP_Query instance.
 *
 * @param mixed $category Optional. Category ID, name, slug, or array of Category IDs, names, and slugs.
 * @return bool
 */
function is_category( $category = '' ) {
	global $wp_query;
 
	if ( ! isset( $wp_query ) ) {
		_doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1' );
		return false;
	}
 
	return $wp_query->is_category( $category );
}

<?php
if(is_category()){
    echo "我只会在分类页显示";
}else
{
    echo "我只显示在非分类页";
}
?>

<?php
if(is_category(‘WordPress函数’)){
    echo "我只会在‘WordPress函数’分类页显示";
}
?>