php-doc-en/reference/network/functions/syslog.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.syslog" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>syslog</refname>
  <refpurpose>Generate a system log message</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>syslog</methodname>
   <methodparam><type>int</type><parameter>priority</parameter></methodparam>
   <methodparam><type>string</type><parameter>message</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>syslog</function> generates a log message that will be
   distributed by the system logger.
  </para>
  <para>
   For information on setting up a user defined log handler, see the
   <citerefentry><refentrytitle>syslog.conf</refentrytitle>
   <manvolnum>5</manvolnum></citerefentry> Unix manual page.  More
   information on the syslog facilities and option can be found in the man
   pages for <citerefentry><refentrytitle>syslog</refentrytitle>
   <manvolnum>3</manvolnum></citerefentry> on Unix machines.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>priority</parameter></term>
     <listitem>
      <para>
       <parameter>priority</parameter> is a combination of the facility and
       the level. Possible values are:
       <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><constant>LOG_EMERG</constant></entry>
           <entry>system is unusable</entry>
          </row>
          <row>
           <entry><constant>LOG_ALERT</constant></entry>
           <entry>action must be taken immediately</entry>
          </row>
          <row>
           <entry><constant>LOG_CRIT</constant></entry>
           <entry>critical conditions</entry>
          </row>
          <row>
           <entry><constant>LOG_ERR</constant></entry>
           <entry>error conditions</entry>
          </row>
          <row>
           <entry><constant>LOG_WARNING</constant></entry>
           <entry>warning conditions</entry>
          </row>
          <row>
           <entry><constant>LOG_NOTICE</constant></entry>
           <entry>normal, but significant, condition</entry>
          </row>
          <row>
           <entry><constant>LOG_INFO</constant></entry>
           <entry>informational message</entry>
          </row>
          <row>
           <entry><constant>LOG_DEBUG</constant></entry>
           <entry>debug-level message</entry>
          </row>
         </tbody>
        </tgroup>
       </table>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>message</parameter></term>
     <listitem>
      <para>
       The message to send, except that the two characters
       <literal>%m</literal> will be replaced by the error message string
       (strerror) corresponding to the present value of
       <errortype>errno</errortype>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Using <function>syslog</function></title>
    <programlisting role="php">
<![CDATA[
<?php
// open syslog, include the process ID and also send
// the log to standard error, and use a user defined
// logging mechanism
openlog("myScriptLog", LOG_PID | LOG_PERROR, LOG_LOCAL0);

// some code

if (authorized_client()) {
    // do something
} else {
    // unauthorized client!
    // log the attempt
    $access = date("Y/m/d H:i:s");
    syslog(LOG_WARNING, "Unauthorized client: $access {$_SERVER['REMOTE_ADDR']} ({$_SERVER['HTTP_USER_AGENT']})");
}

closelog();
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <para>
   On Windows NT, the syslog service is emulated using the Event
   Log.
  </para>
  <note>
   <para>
    Use of <literal>LOG_LOCAL0</literal> through
    <literal>LOG_LOCAL7</literal> for the <parameter>facility</parameter>
    parameter of <function>openlog</function> is not available
    in Windows.
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>openlog</function></member>
    <member><function>closelog</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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