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>checkdnsrr</H1
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><P
> (PHP 3, PHP 4, PHP 5)</P
>checkdnsrr --
Check DNS records corresponding to a given Internet host name or
IP address
</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN148660"
></A
><H2
>Description</H2
>int <B
CLASS="methodname"
>checkdnsrr</B
> ( string host [, string type] )<BR
></BR
><P
> Searches DNS for records of type <CODE
CLASS="parameter"
>type</CODE
>
corresponding to <CODE
CLASS="parameter"
>host</CODE
>. Returns <TT
CLASS="constant"
><B
>TRUE</B
></TT
> if any
records are found; returns <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if no records were found or if
an error occurred.
</P
><P
> <CODE
CLASS="parameter"
>type</CODE
> may be any one of: A, MX, NS, SOA,
PTR, CNAME, AAAA, A6, SRV, NAPTR or ANY. The default is MX.
</P
><P
> <CODE
CLASS="parameter"
>host</CODE
> may either be the IP address in
dotted-quad notation or the host name.
</P
><P
> <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
AAAA type added with PHP 5.0.0
</P
></BLOCKQUOTE
></DIV
>
</P
><P
> <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
This function is not implemented on Windows platforms. Try the
<A
HREF="http://pear.php.net/"
TARGET="_top"
>PEAR</A
> class
<A
HREF="http://pear.php.net/package/Net_DNS"
TARGET="_top"
>Net_DNS</A
>.
</P
></BLOCKQUOTE
></DIV
>
</P
><P
> See also <A
HREF="function.dns-get-record.html"
><B
CLASS="function"
>dns_get_record()</B
></A
>,
<A
HREF="function.getmxrr.html"
><B
CLASS="function"
>getmxrr()</B
></A
>,
<A
HREF="function.gethostbyaddr.html"
><B
CLASS="function"
>gethostbyaddr()</B
></A
>,
<A
HREF="function.gethostbyname.html"
><B
CLASS="function"
>gethostbyname()</B
></A
>,
<A
HREF="function.gethostbynamel.html"
><B
CLASS="function"
>gethostbynamel()</B
></A
>, and the named(8) manual
page.
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