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                                    syslog

   (PHP 3, PHP 4 )
   syslog -- Generate a system log message

Description

   int syslog ( int priority, string message)

   syslog() generates a log message that will be distributed by the
   system logger. priority is a combination of the facility and the
   level, values for which are given in the next section. The remaining
   argument is 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.

   Table 1. 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

   Example 1. Using syslog()
   <?php
   define_syslog_variables();
   // open syslog, include the process ID and also send
   // the log to standard error, and use a user defined
   // logging mechanism
   openlog("myScripLog", 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 $REMOTE_ADDR
   ($HTTP_USER_AGENT)");
   }
   closelog();
   ?>
   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.

   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.

   See also define_syslog_variables(), openlog() and closelog().
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