Predefined Constants

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

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.

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.

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.

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.

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User Contributed Notes 1 note

down

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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