PHP 매뉴얼
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# error_log

(PHP 3, PHP 4 , PHP 5)

error_log -- Send an error message somewhere

## Description

int error_log ( string message [, int message_type [, string destination [, string extra_headers]]])

Sends an error message to the web server's error log, a TCP port or to a file. The first parameter, `message`, is the error message that should be logged. The second parameter, `message_type` says where the message should go:

표 1. 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, `extra_headers` is used. This message type uses the same internal function as mail() does.
2 | `message` is sent through the PHP debugging connection. This option is only available if remote debugging has been enabled. In this case, the `destination` parameter specifies the host name or IP address and optionally, port number, of the socket receiving the debug information.
3 | `message` is appended to the file `destination`.

> 참고: When explicitly specifying the `message_type` as `3`, a newline is not automatically added to the end of the `message` string.

주의
Remote debugging via TCP/IP is a PHP 3 feature that is not available in PHP 4.

예 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");
}
// other ways of calling error_log():
error_log("You messed up!", 2, "127.0.0.1:7000");
error_log("You messed up!", 2, "loghost");
error_log("You messed up!", 3, "/var/tmp/my-errors.log");
?>`

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debug_print_backtrace | 위로 | error_reporting