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Predefined Constants

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

**openlog() Options**
Constant	Description
`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_PERROR`	print log message also to standard error
`LOG_PID`	include PID with each message

**openlog() Facilities**
Constant	Description
`LOG_AUTH`	security/authorization messages (use `LOG_AUTHPRIV` instead in systems where that constant is defined)
`LOG_AUTHPRIV`	security/authorization messages (private)
`LOG_CRON`	clock daemon (cron and at)
`LOG_DAEMON`	other system daemons
`LOG_KERN`	kernel messages
`LOG_LOCAL0 ... LOG_LOCAL7`	reserved for local use, these are not available in Windows
`LOG_LPR`	line printer subsystem
`LOG_MAIL`	mail subsystem
`LOG_NEWS`	USENET news subsystem
`LOG_SYSLOG`	messages generated internally by syslogd
`LOG_USER`	generic user-level messages
`LOG_UUCP`	UUCP subsystem

**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

**dns_get_record() Options**
Constant	Description
`DNS_A`	IPv4 Address Resource
`DNS_CAA`	Certification Authority Authorization Resource (available as of PHP 7.0.16 and 7.1.2)
`DNS_MX`	Mail Exchanger Resource
`DNS_CNAME`	Alias (Canonical Name) Resource
`DNS_NS`	Authoritative Name Server Resource
`DNS_PTR`	Pointer Resource
`DNS_HINFO`	Host Info Resource (See IANA's » Operating System Names for the meaning of these values)
`DNS_SOA`	Start of Authority Resource
`DNS_TXT`	Text Resource
`DNS_ANY`	Any 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_AAAA`	IPv6 Address Resource
`DNS_ALL`	Iteratively query the name server for each available record type.

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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-network.constants.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

Manuel PHP : http://php.net

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

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