<?php is_post_type_archive( $post_types ); ?>

参数：

$post_types

(array/string) (可选) 要判断的post_type可以是一个也可以是数组.

默认值: None

示例：

<?php
if ( is_post_type_archive() ) {
    ?>
    <h1><?php post_type_archive_title(); ?></h1>
    <?php
}
?>

源文件：

/**
 * Is the query for an existing post type archive page?
 *
 * @since 3.1.0
 *
 * @global WP_Query $wp_query
 *
 * @param string|array $post_types Optional. Post type or array of posts types to check against.
 * @return bool
 */
function is_post_type_archive( $post_types = '' ) {
	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_post_type_archive( $post_types );
}