Description:
------------
The function mb_detect_order() can receive either a comma separated list of encodings or an array of encodings. However, its return value varies based on whether it is given a string or an array that contain the same values.

Test script:
---------------
https://3v4l.org/gJfAO

Expected result:
----------------
mb_detect_order() should return the same value regardless of which type is used for the encoding_list parameter. HHVM seems to not be affected by this.

Actual result:
--------------
When given a string, mb_detect_order() will return true if it finds at least one supported encoding in the list.

When given an array, mb_detect_order() will return false if it finds any non-supported encoding.