Generate a system log message

说锟斤拷

syslog ( int $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.

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priority

priority is a combination of the facility and the level. Possible values are:

**syslog()** Priorities (in descending order)
Constant	Description
`LOG_EMERG`	system is unusable
`LOG_ALERT`	action must be taken immediately
`LOG_CRIT`	critical conditions
`LOG_ERR`	error conditions
`LOG_WARNING`	warning conditions
`LOG_NOTICE`	normal, but significant, condition
`LOG_INFO`	informational message
`LOG_DEBUG`	debug-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.

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锟缴癸拷时锟斤拷锟斤拷 TRUE锟斤拷锟斤拷锟斤拷锟斤拷失锟斤拷时锟斤拷锟斤拷 FALSE锟斤拷

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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();
?>

注锟斤拷

On Windows NT, the syslog service is emulated using the Event Log.

Note:
Use of LOG_LOCAL0 through LOG_LOCAL7 for the facility parameter of openlog() is not available in Windows.

锟轿硷拷

openlog() - Open connection to system logger
closelog() - 锟截憋拷系统锟斤拷志锟斤拷锟斤拷