描述：

获取附件页面模版文件attachment.php

用法：

<?php get_attachment_template() ?>

参数：

此函数不接收参数

源文件：

/**
 * Retrieve path of attachment template in current or parent template.
 *
 * The attachment path first checks if the first part of the mime type exists.
 * The second check is for the second part of the mime type. The last check is
 * for both types separated by an underscore. If neither are found then the file
 * 'attachment.php' is checked and returned.
 *
 * Some examples for the 'text/plain' mime type are 'text.php', 'plain.php', and
 * finally 'text-plain.php'.
 *
 * The template path is filterable via the dynamic {@see '$type_template'} hook,
 * e.g. 'attachment_template'.
 *
 * @since 2.0.0
 *
 * @see get_query_template()
 *
 * @global array $posts
 *
 * @return string Full path to attachment template file.
 */
function get_attachment_template() {
	$attachment = get_queried_object();

	$templates = array();

	if ( $attachment ) {
		if ( false !== strpos( $attachment->post_mime_type, '/' ) ) {
			list( $type, $subtype ) = explode( '/', $attachment->post_mime_type );
		} else {
			list( $type, $subtype ) = array( $attachment->post_mime_type, '' );
		}

		if ( ! empty( $subtype ) ) {
			$templates[] = "{$type}-{$subtype}.php";
			$templates[] = "{$subtype}.php";
		}
		$templates[] = "{$type}.php";
	}
	$templates[] = 'attachment.php';

	return get_query_template( 'attachment', $templates );
}