A reference to the XSLT parser.
This parameter is either a boolean value which
toggles logging on and off, or a string containing the
logfile in which log errors too.
This function allows you to set the file in which you
want XSLT log messages to, XSLT log messages are different
than error messages, in that log messages are not actually
error messages but rather messages related to the state of
the XSLT processor. They are useful for debugging XSLT, when
something goes wrong.
By default logging is disabled, in order to enable
logging you must first call
xslt_set_log() with a boolean parameter which enables
logging, then if you want to set the log file to debug to,
you must then pass it a string containing the filename:
注: Please note that file:// is needed in front of path if you use Windows.