Опис

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

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

Параметри

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 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.

destination

**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.

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.

Значення, що повертаються

Повертає true у разі успіху або false в разі помилки. If message_type is zero, this function always returns true, regardless of whether the error could be logged or not.

Журнал змін

Версія	Опис
8.0.0	`destination` and `additional_headers` are now nullable.

Приклади

Приклад #1 error_log() examples

<?php
// Send notification through the server log if we can not
// connect to the database.
if (!Ora_Logon($username, $password)) {
    error_log("Oracle database not available!", 0);
}

// Notify administrator by email if we run out of FOO
if (!($foo = allocate_new_foo())) {
    error_log("Big trouble, we're all out of FOOs!", 1,
               "operator@example.com");
}

// another way to call error_log():
error_log("You messed up!", 3, "/var/tmp/my-errors.log");
?>

Примітки

Увага

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

Підказка

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().