Php/docs/network.constants
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预定义常量
下列常量作为 PHP 核心的一部分总是可用的。
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 |
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 |
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 |
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
» |
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_AAAA
|
IPv6 Address Resource |
DNS_ALL
|
Iteratively query the name server for
each available record type. |