PHP openlog function

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openlog

(PHP 3, PHP 4, PHP 5)

openlog — Open connection to system loggerDescriptionbool openlog ( string ident, int option, int facility )

openlog() opens a connection to the system
logger for a program. The string ident is
added to each message. Values for option
and facility are given below.
The option argument is used to indicate
what logging options will be used when generating a log message.
The facility argument is used to specify what
type of program is logging the message. This allows you to specify
(in your machine’s syslog configuration) how messages coming from
different facilities will be handled.
The use of openlog() is optional. It
will automatically be called by syslog() if
necessary, in which case ident will default
to FALSE.

Table 1. openlog() Options

ConstantDescriptionLOG_CONS if there is an error while sending data to the system logger,
write directly to the system console
LOG_NDELAY open the connection to the logger immediately
LOG_ODELAY (default) delay opening the connection until the first
message is logged
LOG_PERRORprint log message also to standard errorLOG_PIDinclude PID with each message
You can use one or more of this options. When using multiple options
you need to OR them, i.e. to open the connection
immediately, write to the console and include the PID in each message,
you will use: LOG_CONS | LOG_NDELAY | LOG_PID

Table 2. openlog() Facilities

ConstantDescriptionLOG_AUTH security/authorization messages (use LOG_AUTHPRIV instead
in systems where that constant is defined)
LOG_AUTHPRIVsecurity/authorization messages (private)LOG_CRONclock daemon (cron and at)LOG_DAEMONother system daemonsLOG_KERNkernel messagesLOG_LOCAL0 … LOG_LOCAL7reserved for local use, these are not available in WindowsLOG_LPRline printer subsystemLOG_MAILmail subsystemLOG_NEWSUSENET news subsystemLOG_SYSLOGmessages generated internally by syslogdLOG_USERgeneric user-level messagesLOG_UUCPUUCP subsystem

Note:
LOG_USER is the only valid log type under Windows
operating systems

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