Description:
------------
I guess bug #64230 is back in PHP7:
It is not possible to disable errors, neither using \libxml_use_internal_errors(true), nor using option
open($URI, $encoding = null, $options = LIBXML_NOWARNING|LIBXML_NOERROR)


Test script:
---------------
$reader = new \XMLReader();
\libxml_use_internal_errors(true);
$reader->open('fail', null, \LIBXML_NOWARNING|\LIBXML_NOERROR);
$reader->setSchema('fail');

Expected result:
----------------
bool(false)
bool(false) 

Actual result:
--------------
Warning: XMLReader::open(): Unable to open source data in C:\xampp\htdocs\bugReport\index.php on line 4
bool(false)
Warning: XMLReader::setSchema(): Unable to set schema. This must be set prior to reading or schema contains errors. in C:\xampp\htdocs\bugReport\index.php on line 5
bool(false)