CascadiaPHP 2024

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 reserved for local use, not available in Windows
LOG_LOCAL1 reserved for local use, not available in Windows
LOG_LOCAL2 reserved for local use, not available in Windows
LOG_LOCAL3 reserved for local use, not available in Windows
LOG_LOCAL4 reserved for local use, not available in Windows
LOG_LOCAL5 reserved for local use, not available in Windows
LOG_LOCAL6 reserved for local use, not available in Windows
LOG_LOCAL7 reserved for local use, 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_A6 Defined as part of early IPv6 but downgraded to historic by RFC 6563
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_NAPTR Naming Authority Pointer
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_SRV Service locator
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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User Contributed Notes 1 note

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arash dot dalir at gmail dot com
6 years ago
FYI, on windows, the vlaues for LOG_* "log-levels" are as followed:

<?php
namespace Test;

include
'vendor/autoload.php';

use
Psr\Log\LogLevel;

$log_levels = array(
LogLevel::EMERGENCY => LOG_EMERG,
LogLevel::ALERT => LOG_ALERT,
LogLevel::CRITICAL => LOG_CRIT,
LogLevel::ERROR => LOG_ERR,
LogLevel::WARNING => LOG_WARNING,
LogLevel::NOTICE => LOG_NOTICE,
LogLevel::INFO => LOG_INFO,
LogLevel::DEBUG => LOG_DEBUG,
);

print_r($log_levels);
/*
prints:

Array
(
[emergency] => 1
[alert] => 1
[critical] => 1
[error] => 4
[warning] => 5
[notice] => 6
[info] => 6
[debug] => 6
)
*/
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