PHP 4, PHP 5, PHP 7, PHP 8
error_log - Send an error message to the defined error handling routines
Code Examples

     [int$message_type = 0],
     [string|null$destination = null],
     [string|null$additional_headers = null]
): bool

Sends an error message to the web server's error log or to a file.



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 message is sent to PHP's system logger, using the Operating System's system logging mechanism or a file, depending on what the error_log 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, additional_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.


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


The extra headers. It's used when the message_type parameter is set to 1. This message type uses the same internal function as mail does.

Return Values

Returns true on success or false on failure. If message_type is zero, this function always returns true, regardless of whether the error could be logged or not.



error_log is not binary safe. message will be truncated by null character.

message should not contain null character. Note that message may be sent to file, mail, syslog, etc. Use appropriate conversion/escape function, base64_encode, rawurlencode or addslashes before calling error_log.


Version Description
8.0.0 destination and additional_headers are now nullable.

Example of error_log

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Function error_log:

Error Handling and Logging Functions

Most used PHP functions