Predefined Constants

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

Available flags for openlog()

LOG_CONS (int )

If there is an error while sending data to the system logger, write directly to the system console.

LOG_NDELAY (int )

Open the connection to the logger immediately.

LOG_ODELAY (int )

Delay opening the connection until the first message is logged. This is the default behaviour.

LOG_NOWAIT (int )

LOG_PERROR (int )

Additionally log messages to STDERR .

LOG_PID (int )

Include the PID with each log message.

Available facility for openlog()

LOG_AUTH (int )

For security/authorization messages.

Note: Use LOG_AUTHPRIV instead when available.

LOG_AUTHPRIV (int )

For private security/authorization messages.

LOG_CRON (int )

For clock daemon messages. For example cron or at.

LOG_DAEMON (int )

For system daemon messages.

LOG_KERN (int )

For kernel messages.

LOG_LOCAL0 (int )

Reserved for local use.

Warning

Not available on Windows.

LOG_LOCAL1 (int )

Reserved for local use.

Warning

Not available on Windows.

LOG_LOCAL2 (int )

Reserved for local use.

Warning

Not available on Windows.

LOG_LOCAL3 (int )

Reserved for local use.

Warning

Not available on Windows.

LOG_LOCAL4 (int )

Reserved for local use.

Warning

Not available on Windows.

LOG_LOCAL5 (int )

Reserved for local use.

Warning

Not available on Windows.

LOG_LOCAL6 (int )

Reserved for local use.

Warning

Not available on Windows.

LOG_LOCAL7 (int )

Reserved for local use.

Warning

Not available on Windows.

LOG_LPR (int )

For messages from the line printer subsystem.

LOG_MAIL (int )

For messages from the mail subsystem.

LOG_NEWS (int )

For messages from the USENET news subsystem.

LOG_SYSLOG (int )

For messages generated internally by syslogd.

LOG_USER (int )

For generic user-level messages.

LOG_UUCP (int )

For messages from the UUCP subsystem.

Available priority for syslog()

The priority constants are listed from urgent, to debug messages.

LOG_EMERG (int )

Emergency, the system is unusable. This corresponds to a panic condition. Usually broadcast to all processes.

LOG_ALERT (int )

Alert, immediate action is required. For example, a corrupted system database.

LOG_CRIT (int )

Critical, action is required. For example, a hard device errors.

LOG_ERR (int )

Errors messages.

LOG_WARNING (int )

Warning messages.

LOG_NOTICE (int )

Notice messages, corresponds to conditions that are not error conditions, but that may require special handling.

LOG_INFO (int )

Informational messages.

LOG_DEBUG (int )

Debugging messages that contain information normally of use only when debugging a program.

Available types for dns_get_record()

DNS_ANY (int )

Any Resource Record. On most systems this returns all resource records, however due to eccentricities in the performance of libresolv between platforms this is not guaranteed. The slower DNS_ALL will collect all records more reliably.

DNS_ALL (int )

Iteratively query the name server for each available record type.

DNS_A (int )

IPv4 Address Resource.

DNS_AAAA (int )

IPv6 Address Resource.

DNS_A6 (int )

Defined as part of early IPv6, but downgraded to historic by » RFC 6563.

DNS_CAA (int )

Certification Authority Authorization Resource. Available as of PHP 7.0.16 and 7.1.2.

Warning

Not available on Windows.

DNS_CNAME (int )

Alias (Canonical Name) Resource.

DNS_HINFO (int )

Host Info Resource. For more explanations and meanings of these values, visit IANA's page on » Operating System Names.

DNS_MX (int )

Mail Exchanger Resource.

DNS_NAPTR (int )

Naming Authority Pointer.

DNS_NS (int )

Authoritative Name Server Resource.

DNS_PTR (int )

Pointer Resource.

DNS_SOA (int )

Start of Authority Resource.

DNS_SRV (int )

Service locator.

DNS_TXT (int )

Text Resource.

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