(PHP 4, PHP 5, PHP 7)



bool error_log ( string $message [, int $message_type = 0 [, string $destination [, string $extra_headers ]]] )

把错误信息发送到 web 服务器的错误日志,或者到一个文件里。






error_log() 日志类型
0 message 发送到 PHP 的系统日志,使用 操作系统的日志机制或者一个文件,取决于 error_log 指令设置了什么。 这是个默认的选项。
1 message 发送到参数 destination 设置的邮件地址。 第四个参数 extra_headers 只有在这个类型里才会被用到。
2 不再是一个选项。
3 message 被发送到位置为 destination 的文件里。 字符 message 不会默认被当做新的一行。
4 message 直接发送到 SAPI 的日志处理程序中。


目标。它的含义描述于以上,由 message_type 参数所决定。


额外的头。当 message_type 设置为 1 的时候使用。 该信息类型使用了 mail() 的同一个内置函数。


成功时返回 TRUE, 或者在失败时返回 FALSE



error_log() 并非二进制安全的。null 字符可能截断 message


message 不能包含 null 字符。 注意,message 可能会发送到文件、邮件、syslog 等。 所以在调用 error_log() 前需要使用适合的转换/转义函数: base64_encode()rawurlencode()addslashes()


Example #1 error_log() 范例

// 如果无法连接到数据库,发送通知到服务器日志
if (!Ora_Logon($username$password)) {
error_log("Oracle database not available!"0);

// 如果用尽了 FOO,通过邮件通知管理员
if (!($foo allocate_new_foo())) {
error_log("Big trouble, we're all out of FOOs!"1,

// 调用 error_log() 的另一种方式:
error_log("You messed up!"3"/var/tmp/my-errors.log");


版本 说明
5.2.7 可能的值:4添加到了 message_type

add a note add a note

User Contributed Notes 15 notes

kevindougans at gmail dot com
8 years ago
Advice to novices: This function works great along with "tail" which is a unix command to watch a log file live. There are versions of Tail for Windows too, like Tail for Win32 or Kiwi Log Viewer.

Using both error_log() and tail to view the php_error.log you can debug code without having to worry so much about printing debug messages to the screen and who they might be seen by.

Further Note: This works even better when you have two monitors setup. One for your browser and IDE and the other for viewing the log files update live as you go.
roychri at php dot net
7 years ago
There is a limit on the maximum length that you can pass as the $message.

The default seem to be 1024 but can be changed by adjusting the value of the runtime configuration value of 'log_errors_max_len'.

More details here:
php at kennel17 dot NOSPAM dot co dot uk
12 years ago
It appears that the system log = stderr if you are running PHP from the command line, and that often stderr = stdout.  This means that if you are using a custom error to both display the error and log it to syslog, then a command-line user will see the same error reported twice.
i dot buttinoni at intandtel dot com
10 years ago
Be carefull. Unexpected PHP dies when 2GByte of file log reached (on systems having upper file size limit).
A work aorund is rotate logs :)
paul dot chubb at abs dot gov dot au
9 years ago
When logging to apache on windows, both error_log and also trigger_error result in an apache status of error on the front of the message. This is bad if all you want to do is log information. However you can simply log to stderr however you will have to do all message assembly:

LogToApache($Message) {
        $stderr = fopen('php://stderr', 'w');
p dot lhonorey at nospam-laposte dot net
11 years ago
Hi !

Another trick to post "HTML" mail body. Just add "Content-Type: text/html; charset=ISO-8859-1" into extra_header string. Of course you can set charset according to your country or Env or content.

EG: Error_log("<html><h2>stuff</h2></html>",1,"","subject  :lunch\nContent-Type: text/html; charset=ISO-8859-1");

Enjoy !
frank at booksku dot com
11 years ago
Beware!  If multiple scripts share the same log file, but run as different users, whichever script logs an error first owns the file, and calls to error_log() run as a different user will fail *silently*!

Nothing more frustrating than trying to figure out why all your error_log calls aren't actually writing, than to find it was due to a *silent* permission denied error!
eguvenc at gmail dot com
9 years ago
//Multiline error log class
// ersin güvenç 2008
//For break use "\n" instead '\n'

Class log {
const USER_ERROR_DIR = '/home/site/error_log/Site_User_errors.log';
GENERAL_ERROR_DIR = '/home/site/error_log/Site_General_errors.log';

   User Errors...
public function user($msg,$username)
$date = date('d.m.Y h:i:s');
$log = $msg."   |  Date:  ".$date."  |  User:  ".$username."\n";
error_log($log, 3, self::USER_ERROR_DIR);
   General Errors...
public function general($msg)
$date = date('d.m.Y h:i:s');
$log = $msg."   |  Date:  ".$date."\n";
error_log($msg."   |  Tarih:  ".$date, 3, self::GENERAL_ERROR_DIR);


$log = new log();
$log->user($msg,$username); //use for user errors
//$log->general($msg); //use for general errors
10 years ago
"It appears that the system log = stderr if you are running PHP from the command line"

Actually, it seems that PHP logs to stderr if it can't write to the log file. Command line PHP falls back to stderr because the log file is (usually) only writable by the webserver.
14 years ago
when using error_log to send email, not all elements of an extra_headers string are handled the same way.  "From: " and "Reply-To: " header values will replace the default header values. "Subject: " header values won't: they are *added* to the mail header but don't replace the default, leading to mail messages with two Subject fields.


("sometext", 1, "zigzag@my.domain",
"Subject: Foo\nFrom: Rizzlas@my.domain\n");


To: zigzag@my.domain
Envelope-to: zigzag@my.domain
Date: Fri, 28 Mar 2003 13:29:02 -0500
From: Rizzlas@my.domain
Subject: PHP error_log message
Subject: Foo
Delivery-date: Fri, 28 Mar 2003 13:29:03 -0500


quoth the docs: "This message type uses the same internal function as mail() does." 

mail() will also fail to set a Subject field based on extra_header data - instead it takes a seperate argument to specify a "Subject: " string.

php v.4.2.3, SunOS 5.8
stepheneliotdewey at GmailDotCom
10 years ago
Note that since typical email is unencrypted, sending data about your errors over email using this function could be considered a security risk. How much of a risk it is depends on how much and what type of information you are sending, but the mere act of sending an email when something happens (even if it cannot be read) could itself imply to a sophisticated hacker observing your site over time that they have managed to cause an error.

Of course, security through obscurity is the weakest kind of security, as most open source supporters will agree. This is just something that you should keep in mind.

And of course, whatever you do, make sure that such emails don't contain sensitive user data.
daniel dot fukuda at gmail dot com
8 years ago
If you have a problem with log file permission *silently*
it's best to leave error_log directive unset so errors will be written in your Apache log file for current VirtualHost.
franz at fholzinger dot com
12 years ago
In the case of missing your entries in the error_log file:
When you use error_log in a script that does not produce any output, which means that you cannot see anything during the execution of the script, and when you wonder why there are no error_log entries produced in your error_log file, the reasons can be:
- you did not configure error_log output in php.ini
- the script has a syntax error and did therefore not execute
8 years ago
After scouring the internet for getting event logging to
work in syslog on Windows 2003, I found the following
from this post and was able to successfully get Windows
Event Viewer to log PHP errors/notices:

   1. Copy the PHP 5 binaries to "C:\php".
   2. Right-click My Computer and select Properties to bring
up the Computer Properties dialog. Switch to the Advanced
tab and click Environment Variables. Find the system
environment variable PATH, edit it and add ";C:\php"
(without the quotes) to the end.
   3. Make sure that the configuration file "php.ini" resides
in the directory "C:\php" and contains the correct path
   4. DELETE any old "php.ini" files from "C:\WINDOWS"
and other directories.
   5. Open REGEDIT, navigate to the key
"HKLM\SOFTWARE\PHP" and DELETE the string value
"IniFilePath" from there. It is outdated and no longer
   6. Modify NTFS security permissions of the directory
"C:\php" to give Read and Execute permissions to (1) the
IIS Guest Account and (2) the group IIS_WPG.
   7. Modify NTFS security permissions of the directories
"C:\php\session" and "C:\php\upload" to give additional
Modify permissions to (1) the IIS Guest Account and (2)
the group IIS_WPG.
   8. Navigate to the registry key
\Application" and edit the value "CustomSD" there. Find
the substring "(D;;0xf0007;;;BG)" which Denies access to
the application event log for Builtin Guest accounts (like
the IIS Web User account) and replace this substring with
"(A;;0x3;;;BG)" which allows read and write access. Please
pay attention to leave the rest of the security string intact.
Damaging this value can have dangerous effects!
   9. Create or update the registry key
PHP-5.2.0" (adapt the last to your version part
if necessary) with the following values:

          * "EventMessageFile" (REG_EXPAND_SZ) = "C:\php\php5ts.dll"

          * "TypesSupported" (REG_DWORD) = 7
kazezb at nospam dot carleton dot edu
12 years ago
It appears that error_log() only logs the first line of multi-line log messages. To log a multi-line message, either log each line individually or write the message to another file.
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