error-log

message

The error message that should be logged.

message_type

Says where the error should go. The possible message types are as follows:

**error_log() log types**
0	`message` is 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.
1	`message` is sent by email to the address in the `destination` parameter. This is the only message type where the fourth parameter, `extra_headers` is used.
2	No longer an option.
3	`message` is appended to the file `destination`. A newline is not automatically added to the end of the `message` string.
4	`message` is sent directly to the SAPI logging handler.

destination

The destination. Its meaning depends on the message_type parameter as described above.