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<title>Predefined Constants</title>
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<h1>Predefined Constants</h1>
<p class="simpara">
The constants below are always available as part of the PHP core.
</p>
<table class="doctable table">
<caption><strong> <span class="function"><a href="function.openlog.html" class="function">openlog()</a></span> Options</strong></caption>
<thead>
<tr>
<th>Constant</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr id="constant.log-cons">
<td><strong><code>LOG_CONS</code></strong></td>
<td>
if there is an error while sending data to the system logger,
write directly to the system console
</td>
</tr>
<tr id="constant.log-ndelay">
<td><strong><code>LOG_NDELAY</code></strong></td>
<td>
open the connection to the logger immediately
</td>
</tr>
<tr id="constant.log-odelay">
<td><strong><code>LOG_ODELAY</code></strong></td>
<td>
(default) delay opening the connection until the first
message is logged
</td>
</tr>
<tr id="constant.log-nowait">
<td><strong><code>LOG_NOWAIT</code></strong></td>
<td>
</td>
</tr>
<tr id="constant.log-perror">
<td><strong><code>LOG_PERROR</code></strong></td>
<td>print log message also to standard error</td>
</tr>
<tr id="constant.log-pid">
<td><strong><code>LOG_PID</code></strong></td>
<td>include PID with each message</td>
</tr>
</tbody>
</table>
<table class="doctable table">
<caption><strong> <span class="function"><a href="function.openlog.html" class="function">openlog()</a></span> Facilities</strong></caption>
<thead>
<tr>
<th>Constant</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr id="constant.log-auth">
<td><strong><code>LOG_AUTH</code></strong></td>
<td>
security/authorization messages (use <strong><code>LOG_AUTHPRIV</code></strong> instead
in systems where that constant is defined)
</td>
</tr>
<tr id="constant.log-authpriv">
<td><strong><code>LOG_AUTHPRIV</code></strong></td>
<td>security/authorization messages (private)</td>
</tr>
<tr id="constant.log-cron">
<td><strong><code>LOG_CRON</code></strong></td>
<td>clock daemon (cron and at)</td>
</tr>
<tr id="constant.log-daemon">
<td><strong><code>LOG_DAEMON</code></strong></td>
<td>other system daemons</td>
</tr>
<tr id="constant.log-kern">
<td><strong><code>LOG_KERN</code></strong></td>
<td>kernel messages</td>
</tr>
<tr id="constant.log-local0">
<td><strong><code>LOG_LOCAL0 ... LOG_LOCAL7</code></strong></td>
<td>reserved for local use, these are not available in Windows</td>
</tr>
<tr id="constant.log-lpr">
<td><strong><code>LOG_LPR</code></strong></td>
<td>line printer subsystem</td>
</tr>
<tr id="constant.log-mail">
<td><strong><code>LOG_MAIL</code></strong></td>
<td>mail subsystem</td>
</tr>
<tr id="constant.log-news">
<td><strong><code>LOG_NEWS</code></strong></td>
<td>USENET news subsystem</td>
</tr>
<tr id="constant.log-syslog">
<td><strong><code>LOG_SYSLOG</code></strong></td>
<td>messages generated internally by syslogd</td>
</tr>
<tr id="constant.log-user">
<td><strong><code>LOG_USER</code></strong></td>
<td>generic user-level messages</td>
</tr>
<tr id="constant.log-uucp">
<td><strong><code>LOG_UUCP</code></strong></td>
<td>UUCP subsystem</td>
</tr>
</tbody>
</table>
<table class="doctable table">
<caption><strong> <span class="function"><a href="function.syslog.html" class="function">syslog()</a></span> Priorities (in descending order)</strong></caption>
<thead>
<tr>
<th>Constant</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr id="constant.log-emerg">
<td><strong><code>LOG_EMERG</code></strong></td>
<td>system is unusable</td>
</tr>
<tr id="constant.log-alert">
<td><strong><code>LOG_ALERT</code></strong></td>
<td>action must be taken immediately</td>
</tr>
<tr id="constant.log-crit">
<td><strong><code>LOG_CRIT</code></strong></td>
<td>critical conditions</td>
</tr>
<tr id="constant.log-err">
<td><strong><code>LOG_ERR</code></strong></td>
<td>error conditions</td>
</tr>
<tr id="constant.log-warning">
<td><strong><code>LOG_WARNING</code></strong></td>
<td>warning conditions</td>
</tr>
<tr id="constant.log-notice">
<td><strong><code>LOG_NOTICE</code></strong></td>
<td>normal, but significant, condition</td>
</tr>
<tr id="constant.log-info">
<td><strong><code>LOG_INFO</code></strong></td>
<td>informational message</td>
</tr>
<tr id="constant.log-debug">
<td><strong><code>LOG_DEBUG</code></strong></td>
<td>debug-level message</td>
</tr>
</tbody>
</table>
<table class="doctable table">
<caption><strong> <span class="function"><a href="function.dns-get-record.html" class="function">dns_get_record()</a></span> Options</strong></caption>
<thead>
<tr>
<th>Constant</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr id="constant.dns-a">
<td><strong><code>DNS_A</code></strong></td>
<td>IPv4 Address Resource</td>
</tr>
<tr id="constant.dns-mx">
<td><strong><code>DNS_MX</code></strong></td>
<td>Mail Exchanger Resource</td>
</tr>
<tr id="constant.dns-cname">
<td><strong><code>DNS_CNAME</code></strong></td>
<td>Alias (Canonical Name) Resource</td>
</tr>
<tr id="constant.dns-ns">
<td><strong><code>DNS_NS</code></strong></td>
<td>Authoritative Name Server Resource</td>
</tr>
<tr id="constant.dns-ptr">
<td><strong><code>DNS_PTR</code></strong></td>
<td>Pointer Resource</td>
</tr>
<tr id="constant.dns-hinfo">
<td><strong><code>DNS_HINFO</code></strong></td>
<td>Host Info Resource (See IANA's
<a href="http://www.iana.org/assignments/operating-system-names" class="link external">» <em>Operating System Names</em></a>
for the meaning of these values)</td>
</tr>
<tr id="constant.dns-soa">
<td><strong><code>DNS_SOA</code></strong></td>
<td>Start of Authority Resource</td>
</tr>
<tr id="constant.dns-txt">
<td><strong><code>DNS_TXT</code></strong></td>
<td>Text Resource</td>
</tr>
<tr id="constant.dns-any">
<td><strong><code>DNS_ANY</code></strong></td>
<td>Any Resource Record. On most systems
this returns all resource records, however
it should not be counted upon for critical
uses. Try <strong><code>DNS_ALL</code></strong> instead.</td>
</tr>
<tr id="constant.dns-aaaa">
<td><strong><code>DNS_AAAA</code></strong></td>
<td>IPv6 Address Resource</td>
</tr>
<tr id="constant.dns-all">
<td><strong><code>DNS_ALL</code></strong></td>
<td>Iteratively query the name server for
each available record type.</td>
</tr>
</tbody>
</table>
</div>
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