Resource Types
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PHP Manual

# Predefined Constants

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_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.

Resource Types
Network Functions
Network
PHP Manual