PHP判断文件是否被引入的方法get_included_files用法

<?php
// 本文件是 abc.php
include 'test1.php';
include_once 'test2.php';
require 'test3.php';
require_once 'test4.php';
$included_files = get_included_files();
foreach ($included_files as $filename) {
  echo "$filename\n";
}
?>

abc.php
test1.php
test2.php
test3.php
test4.php

D:\xampp\htdocs\duanzu\index.php
D:\xampp\htdocs\duanzu\phpcms\base.php
D:\xampp\htdocs\duanzu\phpcms\libs\functions\global.func.php
D:\xampp\htdocs\duanzu\phpcms\libs\functions\extention.func.php
D:\xampp\htdocs\duanzu\phpcms\libs\functions\autoload\plugin.func.php
D:\xampp\htdocs\duanzu\phpcms\libs\functions\autoload\video.func.php
D:\xampp\htdocs\duanzu\caches\configs\system.php
D:\xampp\htdocs\duanzu\phpcms\libs\classes\application.class.php
D:\xampp\htdocs\duanzu\phpcms\libs\classes\param.class.php
D:\xampp\htdocs\duanzu\caches\configs\route.php
D:\xampp\htdocs\duanzu\phpcms\modules\home\mon.php
D:\xampp\htdocs\duanzu\phpcms\model\user_model.class.php
D:\xampp\htdocs\duanzu\phpcms\libs\classes\model.class.php
D:\xampp\htdocs\duanzu\phpcms\libs\classes\db_factory.class.php
D:\xampp\htdocs\duanzu\caches\configs\database.php
D:\xampp\htdocs\duanzu\phpcms\libs\classes\db_mysqli.class.php
D:\xampp\htdocs\duanzu\phpcms\libs\classes\sendsms.class.php
D:\xampp\htdocs\duanzu\phpcms\plugin\Taobao\TopSdk.php
D:\xampp\htdocs\duanzu\phpcms\plugin\Taobao\Autoloader.php