error_log()

(PHP 4, PHP 5, PHP 7)

发送错误信息到某个地方

说明

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。

参数

应该被记录的错误信息。

设置错误应该发送到何处。可能的信息类型有以下几个：

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。

返回值

成功时返回TRUE，或者在失败时返回FALSE。

注释

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()或addslashes()。

范例

Example #1error_log()范例

---------------%

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.

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:
http://forums.iis.net/p/1159662/1912015.aspx#1913338
  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 
settings.
  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 It is outdated and no longer 
necessary!
  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 
"HKLM\SYSTEM\CurrentControlSet\Services\Eventlog
\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 
"HKLM\SYSTEM\CurrentControlSet\Services\Eventlog\Application\
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

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.

When error_log() unexpectedly uses stdout, you should check if the php.ini value for error_log is empty in your CLI environment. Something as simple as this might restore expected behavior: 

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