php-doc-en/reference/network/constants.xml

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<section id="network.constants">
 &reftitle.constants;
 &extension.constants.core;
  <table>
   <title><function>openlog</function> Options</title>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>Constant</entry>
      <entry>Description</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>LOG_CONS</entry>
      <entry>
       if there is an error while sending data to the system logger,
       write directly to the system console
      </entry>
     </row>
     <row>
      <entry>LOG_NDELAY</entry>
      <entry>
       open the connection to the logger immediately 
      </entry>
     </row>
     <row>
      <entry>LOG_ODELAY</entry>
      <entry>
       (default) delay opening the connection until the first
       message is logged
      </entry>
     </row>
     <row>
      <entry>LOG_NOWAIT</entry>
      <entry>
      </entry>
     </row>
     <row>
      <entry>LOG_PERROR</entry>
      <entry>print log message also to standard error</entry>
     </row>
     <row>
      <entry>LOG_PID</entry>
      <entry>include PID with each message</entry>
     </row>
    </tbody>
   </tgroup>
  </table>

  <table>
   <title><function>openlog</function> Facilities</title>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>Constant</entry>
      <entry>Description</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>LOG_AUTH</entry>
      <entry>
       security/authorization messages (use LOG_AUTHPRIV instead
       in systems where that constant is defined)
      </entry>
     </row>
     <row>
      <entry>LOG_AUTHPRIV</entry>
      <entry>security/authorization messages (private)</entry>
     </row>
     <row>
      <entry>LOG_CRON</entry>
      <entry>clock daemon (cron and at)</entry>
     </row>
     <row>
      <entry>LOG_DAEMON</entry>
      <entry>other system daemons</entry>
     </row>
     <row>
      <entry>LOG_KERN</entry>
      <entry>kernel messages</entry>
     </row>
     <row>
      <entry>LOG_LOCAL0 ... LOG_LOCAL7</entry>
      <entry>reserved for local use, these are not available in Windows</entry>
     </row>
     <row>
      <entry>LOG_LPR</entry>
      <entry>line printer subsystem</entry>
     </row>
     <row>
      <entry>LOG_MAIL</entry>
      <entry>mail subsystem</entry>
     </row>
     <row>
      <entry>LOG_NEWS</entry>
      <entry>USENET news subsystem</entry>
     </row>
     <row>
      <entry>LOG_SYSLOG</entry>
      <entry>messages generated internally by syslogd</entry>
     </row>
     <row>
      <entry>LOG_USER</entry>
      <entry>generic user-level messages</entry>
     </row>
     <row>
      <entry>LOG_UUCP</entry>
      <entry>UUCP subsystem</entry>
     </row>
    </tbody>
   </tgroup>
  </table>

  <table>
   <title><function>syslog</function> Priorities (in descending order)</title>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>Constant</entry>
      <entry>Description</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>LOG_EMERG</entry>
      <entry>system is unusable</entry>
     </row>
     <row>
      <entry>LOG_ALERT</entry>
      <entry>action must be taken immediately</entry>
     </row>
     <row>
      <entry>LOG_CRIT</entry>
      <entry>critical conditions</entry>
     </row>
     <row>
      <entry>LOG_ERR</entry>
      <entry>error conditions</entry>
     </row>
     <row>
      <entry>LOG_WARNING</entry>
      <entry>warning conditions</entry>
     </row>
     <row>
      <entry>LOG_NOTICE</entry>
      <entry>normal, but significant, condition</entry>
     </row>
     <row>
      <entry>LOG_INFO</entry>
      <entry>informational message</entry>
     </row>
     <row>
      <entry>LOG_DEBUG</entry>
      <entry>debug-level message</entry>
     </row>
    </tbody>
   </tgroup>
  </table>
  <table>
   <title><function>dns_get_record</function> Options</title>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>Constant</entry>
      <entry>Description</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>DNS_A</entry>
      <entry>IPv4 Address Resource</entry>
     </row>
     <row>
      <entry>DNS_MX</entry>
      <entry>Mail Exchanger Resource</entry>
     </row>
     <row>
      <entry>DNS_CNAME</entry>
      <entry>Alias (Canonical Name) Resource</entry>
     </row>
     <row>
      <entry>DNS_NS</entry>
      <entry>Authoritative Name Server Resource</entry>
     </row>
     <row>
      <entry>DNS_PTR</entry>
      <entry>Pointer Resource</entry>
     </row>
     <row>
      <entry>DNS_HINFO</entry>
      <entry>Host Info Resource (See IANA's
        <ulink url="&url.iana.system-names;">Operating System Names</ulink>
        for the meaning of these values)</entry>
     </row>
     <row>
      <entry>DNS_SOA</entry>
      <entry>Start of Authority Resource</entry>
     </row>
     <row>
      <entry>DNS_TXT</entry>
      <entry>Text Resource</entry>
     </row>
     <row>
      <entry>DNS_ANY</entry>
      <entry>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.</entry>
     </row>
     <row>
      <entry>DNS_AAAA</entry>
      <entry>IPv6 Address Resource</entry>
     </row>
     <row>
      <entry>DNS_ALL</entry>
      <entry>Itteratively query the name server for
        each available record type.</entry>
     </row>
    </tbody>
   </tgroup>
  </table>
</section>

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