syslog
(PHP 4, PHP 5, PHP 7)
syslog — Generate a system log message
说明
$priority ,
string $message ) :
bool
syslog() generates a log message that will be distributed by the system logger.
For information on setting up a user defined log handler, see the syslog.conf (5) Unix manual page. More information on the syslog facilities and option can be found in the man pages for syslog (3) on Unix machines.
参数
-
priority -
priorityis a combination of the facility and the level. Possible values are:syslog() Priorities (in descending order) Constant Description LOG_EMERGsystem is unusable LOG_ALERTaction must be taken immediately LOG_CRITcritical conditions LOG_ERRerror conditions LOG_WARNINGwarning conditions LOG_NOTICEnormal, but significant, condition LOG_INFOinformational message LOG_DEBUGdebug-level message -
message -
The message to send, except that the two characters %m will be replaced by the error message string (strerror) corresponding to the present value of errno.
返回值
成功时返回 TRUE， 或者在失败时返回 FALSE。
范例
Example #1 Using syslog()
<?php
// open syslog, include the process ID and also send
// the log to standard error, and use a user defined
// logging mechanism
openlog("myScriptLog", LOG_PID | LOG_PERROR, LOG_LOCAL0);
// some code
if (authorized_client()) {
// do something
} else {
// unauthorized client!
// log the attempt
$access = date("Y/m/d H:i:s");
syslog(LOG_WARNING, "Unauthorized client: $access {$_SERVER['REMOTE_ADDR']} ({$_SERVER['HTTP_USER_AGENT']})");
}
closelog();
?>
注释
On Windows NT, the syslog service is emulated using the Event Log.
Note:
Use of LOG_LOCAL0 through LOG_LOCAL7 for the
facilityparameter of openlog() is not available in Windows.
