The error message that should be logged.
Says where the error should go. The possible message types are as follows:
error_log() log types 0
messageis sent to PHP’s system logger, using the Operating System’s system logging mechanism or a file, depending on what the configuration directive is set to. This is the default option.
messageis sent by email to the address in the
destinationparameter. This is the only message type where the fourth parameter,
2 No longer an option. 3
messageis appended to the file
destination. A newline is not automatically added to the end of the
messageis sent directly to the SAPI logging handler.
The destination. Its meaning depends on the
message_typeparameter as described above.