似乎您正在访问的url中存在一些重定向问题，并且很可能simplexml_load_file()没有遵循重定向...

Seems like there is some redirection problem in the url you are accessing, and most probably simplexml_load_file() doesn't follow redirects...

因此解决方案是使用file_get_contents()或cUrl ...

So the solution would be to use file_get_contents() or cUrl...

由于file_get_contents()更容易，我只显示...

As file_get_contents() is easier, I am showing that only...

代码必须类似于:

<?php

    $xml = simplexml_load_string(file_get_contents('http://example_page.ugu.pl/api/test.xml'));

?>

更多:

<?php

    $xml = simplexml_load_string(file_get_contents('http://jakdojade.pl/pages/api/outputs/schedules.xml'));

?>

^那也完全可行！