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[edit] Last updated: Fri, 25 May 2012

syslog

(PHP 4, PHP 5)

syslog — Генерирует сообщение для системного журнала

Описание

bool syslog ( int $priority , string $message )

Функция syslog() генерирует сообщение, которое направляется в системный журнал.

По поводу информации по установке пользовательского обработчика сообщений журнала см. Unix руководство в части syslog.conf (5). Дополнительную информацию по функционалу syslog можно получить с помощью man для syslog (3) на Unix машинах.

Список параметров

priority

Параметр priority - это комбинация установки и уровня. Возможными значениями являются:

**syslog()** приоритеты (по убыванию)
Константа	Описание
`LOG_EMERG`	система непригодна
`LOG_ALERT`	необходимы незамедлительные меры
`LOG_CRIT`	критические условия
`LOG_ERR`	условия ошибки
`LOG_WARNING`	условия предупреждения
`LOG_NOTICE`	нормальные, но значительные условия
`LOG_INFO`	информационноые сообщение
`LOG_DEBUG`	сообщение отладки

Параметр message

Отсылаемое сообщение, исключая то, что два символа %m будут заменены строкой сообщения об ошибке (strerror), соответствующей текущему значению errno.

Возвращаемые значения

Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.

Примеры

Пример #1 Пример использования syslog()


<?php
// открыть syslog, включить в сообщение ID процесса, также отправить
// сообщение, и использовать определенный пользователем
// механизм журналирования
openlog("myScriptLog", LOG_PID | LOG_PERROR, LOG_LOCAL0);

// некий код

if (authorized_client()) {
    // исполнение любого кода
} else {
    // неавторизованный клиент!
    // отправить сообщение журнала о попытке
    $access = date("Y/m/d H:i:s");
    syslog(LOG_WARNING, "Неавторизованный клиент: $access {$_SERVER['REMOTE_ADDR']} ({$_SERVER['HTTP_USER_AGENT']})");
}

closelog();
?>

Примечания

На Windows NT, служба syslog эмулируется используя Журнал Событий.

Замечание:
Использование LOG_LOCAL0 через LOG_LOCAL7 для параметра facility в функции openlog() недоступно в Windows.

Смотрите также

openlog() - Открывает соединение к системному журналу
closelog() - Завершает соединение с системным журналом

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[edit] Last updated: Fri, 25 May 2012

add a note User Contributed Notes syslog

Antonio Lobato 11-May-2010 01:57


A word of warning; if you use openlog() to ready syslog() and your Apache threads accept multiple requests, you *must* call closelog() if Apache's error log is configured to write to syslog.  Failure to do so will cause Apache's error log to write to whatever facility/ident was used in openlog.



Example, in httpd.conf you have:



ErrorLog syslog:local7



and in php you do:



<?php

openlog("myprogram", 0, LOG_LOCAL0);

syslog("My syslog message");

?>



From here on out, this Apache thread will write ErrorLog to local0 and under the process name "myprogram" and not httpd!  Calling closelog() will fix this.

james dot ellis at gmail dot com 02-Dec-2007 08:26


If anyone is wondering why their log messages are appearing in multiple log files, here is one answer applying to *nix systems:



If your syslog.conf looks like this (assuming you use LOG_LOCAL0 for web app logging) :



local0.info    /var/log/web/info.log



This will collect *all* messages of LOG_INFO level and higher, i.e everything except debug messages



Try this instead to ensure that only messages of the named log level go into the relevant log file:



local0.=info    /var/log/web/info.log



Additionally, you may like to add this to ensure your messages don't end up in generic log files like "messages"  "all" "syslog" and "debug":



local0.none    /var/log/messages

local0.none    /var/log/debug

etc



saves disk space among other things - more at "man syslog.conf"

helly at php dot net 13-Apr-2007 05:49


If you are using syslog-ng and want errors send to syslog then use ini setting "error_log = syslog" and add something like the following to your syslog-ng.conf:



destination php { file("/var/log/php.log" owner(root) group(devel) perm(0620)); };

log { source(src); filter(f_php); destination(php); };

adam _at_ lockdownnetworks _dot_ com 10-Apr-2007 06:32


Be aware when using syslog() that if you set the timezone of environment to be something other than the standard, syslog() may log the time to the log(s) with the wrong time zone information. For example:



<?php



openlog('mylog', LOG_PID | LOG_ODELAY,LOG_LOCAL4);



putenv('TZ=UTC');

syslog(LOG_INFO, 'UTC Log line');



putenv('TZ=US/Pacific');

syslog(LOG_INFO, 'US/Pacific Log line');



closelog();



?>



Viewing the /usr/log/messages log will display these two lines:



Apr 11 01:25:39 hostname mylog[1400]: UTC Log line

Apr 10 18:25:39 hostname mylog[1400]: US/Pacific Log line



Adam.

Torsten 23-Apr-2004 06:27


I had a problem trying to issue a syslog message with IIS 5.1 under Windows XP. The function call seemed to succeed, but the event viewer showed that no entry was made.

Finally I found out that the user account used for the webserver (IUSR_<Computername>) did not have enough permissions to issue syslog alerts. I changed this by adding this user to the Users group instead of only Guest.

daniele dot patoner at biblio dot unitn dot it 06-Nov-2003 11:00


This work for me, to redirect  logs to a separate syslog file



put this line in your /etc/syslog.conf :



local0.debug   /var/log/php.log



Then restart syslogd:



/etc/init.d/syslog restart



php example:



<?php

define_syslog_variables();

openlog("TextLog", LOG_PID, LOG_LOCAL0);



$data = date("Y/m/d H:i:s");

syslog(LOG_DEBUG,"Messagge: $data");



closelog();

?>

gregj at pdxperts dot com 28-Jul-2003 05:05


The message string sent to the log file is limited to 500 characters.

monte at ispi dot net 03-Jul-2003 11:05


If you have php.ini setup to send PHP errors to syslog, they will all get dumped into /var/log/messages (at least it does with RedHat 9 by default). I wanted to figure out how to get PHP errors to go to their own syslog file.



After some trial and error, I figured out what facility and priority PHP uses, which is "user.notice". So, to get your PHP errors going to a separate syslog file, put this line in your /etc/syslog.conf :



user.notice   /var/log/php.log



Then restart syslogd:



/etc/init.d/syslog restart



Why PHP uses "user" as the facility I'm not sure, probably because it's the only one that works under Windows?



Monte

nospam \100 jraxis com (that's right!) 31-Mar-2002 08:32


This *does* actually goto the system log as configured in /etc/syslog.conf (such as /var/log/messages), it doesn't goto Apache's ErrorLog (such as /var/log/httpd/error_log). At least under my Debian Potato with Apache 1.3.23.



Use error_log() to be sure it gets into Apache's ErrorLog.

dpreece at paradise dot net dot nz 29-Jan-2002 04:08


To set up a custom log file via the syslog daemon (FreeBSD in this case)...



Add to /etc/syslog.conf a line that says all errors from the httpd process are to go to a file called (for example) /var/log/httpd-php.log



!httpd

*.*   {tab}   /var/log/httpd-php.log



Note the tab, being a tab character! Next create a blank file to be written to. I'm sure there are 1e+6 ways to do this, but I choose



# cat > httpd-php.log << EOF

? EOF



Finally find your syslog daemon and send it a sighup to inform it of the change:



# ps ax | grep syslogd

  133  ??  Ss     0:07.23 syslogd -s

# kill -1 133



Et voila! Php syslog calls will now arrive in /var/log/httpd-php.log

mavetju at chello dot nl 22-Jan-2001 06:11


With FreeBSD I can use: syslog(LOG_INFO,"test");





BSD/OS does not support this, I had to use the literal values for the priority (158: local3.info):


syslog(158,"test");

gherson at snet dot net 20-Dec-2000 01:09


Example of where to look for syslog's output:   /var/log/httpd/access_log


(on Red Hat Linux Secure Server v6.2).

rcgraves+php at brandeis dot edu 17-Feb-2000 12:51


For the-header-file-enabled:





man 3 syslog defines the priorities, but not the integer values. For that you'll need to read your system header file.





Let's suppose I want to log an informational message in the mail log (which happens to be true). The man page tells me I want LOG_MAIL|LOG_INFO. So I look in /usr/include/sys/syslog.h and find (this happens to be Linux, your system could be different):





#define LOG_INFO        6       /* informational */


#define LOG_MAIL        (2<<3)  /* mail system */





2<<3 means shift 3 bits left, which means multiply by 8. So I want 2*8 + 6 = 22. syslog(22,"this message will appear in the mail log"); And indeed it does.

bb at lb-data dot co dot at 08-Sep-1999 03:54


In Windows NT, use the following values of priority:


1 = error,


6 = info

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