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

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.checkdnsrr" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>checkdnsrr</refname>
  <refpurpose>Check DNS records corresponding to a given Internet host name or IP address</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>checkdnsrr</methodname>
   <methodparam><type>string</type><parameter>host</parameter></methodparam>
   <methodparam choice="opt"><type>string</type><parameter>type</parameter><initializer>"MX"</initializer></methodparam>
  </methodsynopsis>
  <para>
   Searches DNS for records of type <parameter>type</parameter>
   corresponding to <parameter>host</parameter>. 
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>host</parameter></term>
     <listitem>
      <para>
       <parameter>host</parameter> may either be the IP address in
       dotted-quad notation or the host name.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>type</parameter></term>
     <listitem>
      <para>
       <parameter>type</parameter> may be any one of: A, MX, NS, SOA,
       PTR, CNAME, AAAA, A6, SRV, NAPTR, TXT or ANY.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns &true; if any records are found; returns &false; if no records
   were found or if an error occurred.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>5.3.0</entry>
       <entry>
         This function is now available on Windows platforms.
       </entry>
      </row>
      <row>
       <entry>5.2.4</entry>
       <entry>
        TXT <parameter>type</parameter> was added.
       </entry>
      </row>
      <row>
       <entry>5.0.0</entry>
       <entry>
        AAAA <parameter>type</parameter> was added.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    For compatibility with Windows before this was implemented, then try the
    <link xlink:href="&url.php.pear;">PEAR</link> class
    <link xlink:href="&url.pear.package;Net_DNS">Net_DNS</link>.
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>dns_get_record</function></member>
    <member><function>getmxrr</function></member>
    <member><function>gethostbyaddr</function></member>
    <member><function>gethostbyname</function></member>
    <member><function>gethostbynamel</function></member>
    <member>the named(8) manual page</member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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