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error_log

Description

The error_log Error Handling for PHP send an error message to the defined error handling routines.

Syntax

error_log(
    string $message,
    int $message_type = 0,
    ?string $destination = null,
    ?string $additional_headers = null
): bool

Parameters

message

The error message that should be logged.

message_type

Says where the error should go.

NumberDescription
0message 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.
1message 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.
2No longer an option.
3message is appended to the file destination. A newline is not automatically added to the end of the message string.
4message is sent directly to the SAPI logging handler.

destination

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

additional_headers

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

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.

Examples

1 · message

<?

$message = "message";

$return = error_log($message);

var_export($return);

?>
true

2 · message_type · 0

<?

$message = "message";
$message_type = 0;

$return = error_log($message, $message_type);

var_export($return);

?>
true

3 · message_type · 1 · destination

<?

$message = "message";
$message_type = 1;
$destination = "myemail@mydomain.com";

$return = error_log($message, $message_type, $destination);

var_export($return);

?>
true

4 · message_type · 1 · additional_headers

<?

$message = "message";
$message_type = 1;
$destination = "myemail@mydomain.com";
$additional_headers = "additional_headers";

$return = error_log($message, $message_type, $destination, $additional_headers);

var_export($return);

?>
true

5 · message_type · 3

<?

$message = "message";
$message_type = 3;
$destination = "/tmp/myerror.log";

$return = error_log($message, $message_type, $destination);

var_export($return);

?>
true

6 · message_type · 4

<?

$message = "message";
$message_type = 4;

$return = error_log($message, $message_type);

var_export($return);

?>
true

7 · destination

<?

$message = "message";
$message_type = 1;
$destination = "myemail@mydomain.com";

$return = error_log($message, $message_type, $destination);

var_export($return);

?>
true

8 · additional_headers

<?

$message = "message";
$message_type = 1;
$destination = "myemail@mydomain.com";
$additional_headers = "additional_headers";

$return = error_log($message, $message_type, $destination, $additional_headers);

var_export($return);

?>
true
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