The E_WARNING message from the PHP function lchown is passed
from the system function lchown. The error message returned
from lchown can be filesystem dependent.
https://github.com/php/php-src/blob/
6053987bc27e8dede37f437193a5cad448f99bce/ext/standard/filestat.c#L406
Warning: lchown() expects parameter 1 to be a valid path, array given in %s on line %d
bool(true)
-Warning: lchown(): Operation not permitted in %s on line %d
+Warning: lchown(): %r(Operation not permitted|Invalid argument)%r in %s on line %d
bool(false)
===DONE===