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.