Predefined Constants

    The constants below are always available as part of the PHP core.

    openlog() Options
    ConstantDescription
    LOG_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_NOWAIT
    LOG_PERRORprint log message also to standard error
    LOG_PIDinclude PID with each message
    openlog() Facilities
    ConstantDescription
    LOG_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 daemons
    LOG_KERNkernel messages
    LOG_LOCAL0reserved for local use, not available in Windows
    LOG_LOCAL1reserved for local use, not available in Windows
    LOG_LOCAL2reserved for local use, not available in Windows
    LOG_LOCAL3reserved for local use, not available in Windows
    LOG_LOCAL4reserved for local use, not available in Windows
    LOG_LOCAL5reserved for local use, not available in Windows
    LOG_LOCAL6reserved for local use, not available in Windows
    LOG_LOCAL7reserved for local use, not available in Windows
    LOG_LPRline printer subsystem
    LOG_MAILmail subsystem
    LOG_NEWSUSENET news subsystem
    LOG_SYSLOGmessages generated internally by syslogd
    LOG_USERgeneric user-level messages
    LOG_UUCPUUCP subsystem
    syslog() Priorities (in descending order)
    ConstantDescription
    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
    dns_get_record() Options
    ConstantDescription
    DNS_AIPv4 Address Resource
    DNS_CAACertification Authority Authorization Resource (available as of PHP 7.0.16 and 7.1.2)
    DNS_MXMail Exchanger Resource
    DNS_CNAMEAlias (Canonical Name) Resource
    DNS_NSAuthoritative Name Server Resource
    DNS_PTRPointer Resource
    DNS_HINFOHost Info Resource (See IANA's » Operating System Names for the meaning of these values)
    DNS_SOAStart of Authority Resource
    DNS_TXTText Resource
    DNS_ANYAny Resource Record. On most systems this returns all resource records, however it should not be counted upon for critical uses. Try DNS_ALL instead.
    DNS_AAAAIPv6 Address Resource
    DNS_ALLIteratively query the name server for each available record type.
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