Description:
------------
I started to get 
file(): http:// wrapper is disabled in the server configuration by allow_url_fopen=0
file(http://www.cnb.cz/cs/financni_trhy/devizovy_trh/kurzy_devizoveho_trhu/denni_kurz.txt?date=17.06.2017): failed to open stream: no suitable wrapper could be found
after upgrading from PHP 7.1.5 to 7.1.6. 

The error disappears after downgrading back to 7.1.5.

No configuration change has been made. Just overwriting files from the windows distribution package for the respective NTS VC14 x64 version.

I have double checked the change logs but found nothing relevant.

The php.ini contains per-directory settings of allow_url_fopen.

The following line throws the error:
    $lines = file($url, FILE_IGNORE_NEW_LINES);
where
$url was http://www.cnb.cz/cs/financni_trhy/devizovy_trh/kurzy_devizoveho_trhu/denni_kurz.txt?date=17.06.201

Test script:
---------------
The issue have appeared on the production server. I have immediately downgraded to PHP 7.1.5 so I have no test script available.

Expected result:
----------------
The PHP behavior is the same for both 7.1.5 and 7.1.6 in this case.

Actual result:
--------------
An error message started to be thrown in 7.1.6.