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

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  <refentry id="function.checkdnsrr">
   <refnamediv>
    <refname>checkdnsrr</refname>
    <refpurpose>
     Check DNS records corresponding to a given Internet host name or
     IP address
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>int</type><methodname>checkdnsrr</methodname>
      <methodparam><type>string</type><parameter>host</parameter></methodparam>
      <methodparam choice="opt"><type>string</type><parameter>type</parameter></methodparam>
     </methodsynopsis>
    <simpara>
     Searches DNS for records of type <parameter>type</parameter>
     corresponding to <parameter>host</parameter>. Returns &true; if any
     records are found; returns &false; if no records were found or if
     an error occurred.
    </simpara>
    <simpara>
     <parameter>type</parameter> may be any one of: A, MX, NS, SOA,
     PTR, CNAME, AAAA, or ANY.  The default is MX.
    </simpara>
    <simpara>
     <parameter>Host</parameter> may either be the IP address in
     dotted-quad notation or the host name.
    </simpara>
    <para>
     <note>
      <simpara>
       AAAA type added with PHP 4.3.0
      </simpara>
     </note>
    </para>
    <para>
     <note>
      <simpara>
       This function is not implemented on Windows platforms. Try the
       <ulink url="&url.php.pear;">PEAR</ulink> class
       <ulink url="&url.pear.net-dns;">Net_DNS</ulink>.
      </simpara>
     </note>
    </para>
    <simpara>
     See also <function>getmxrr</function>,
     <function>gethostbyaddr</function>,
     <function>gethostbyname</function>,
     <function>gethostbynamel</function>, and the named(8) manual
     page.
    </simpara>
   </refsect1>
  </refentry>

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