Description:
------------
This issue came up in the discussions for bz #74860.

Basically, the only type of message explicitly and unequivocally allowed by the Syslog RFC's is NVT ASCII (i.e. hex characters 0x20-0x7E).

UTF-8 maybe used in compressed (shortest form) but it must be prefixed with a BOM (0xEF,0xBB,0xBF).

Also, see the discussion for PR #2674.



Test script:
---------------
<?php

ini_set("error_log", "syslog");

error_log("h\364pital stra\337e", 0);

error_log("this string \321\032\003", 0);

?>


Expected result:
----------------
It's not obvious what the correct behavior is in legacy cases which violate the RFC's.



Actual result:
--------------
Aug 15 14:43:07 ubuntu16 php7.0: h?pital stra?e
Aug 15 14:43:07 ubuntu16 php7.0: this string ?#032#003