External
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<?php
/******************************************************
These functions can be used on WindowsNT to replace
their built-in counterparts that do not work as
expected.
checkdnsrr_winNT() works just the same, returning true
or false
getmxrr_winNT() returns true or false and provides a
list of MX hosts in order of preference.
*******************************************************/
function checkdnsrr_winNT( $host, $type = '' )
{
if( !empty( $host ) )
{
# Set Default Type:
if( $type == '' ) $type = "MX";
@exec( "nslookup -type=$type $host", $output );
while( list( $k, $line ) = each( $output ) )
{
# Valid records begin with host name:
if( eregi( "^$host", $line ) )
{
# record found:
return true;
}
}
return false;
}
}
function getmxrr_winNT( $hostname, &$mxhosts )
{
if( !is_array( $mxhosts ) ) $mxhosts = array();
if( !empty( $hostname ) )
{
@exec( "nslookup -type=MX $hostname", $output, $ret );
while( list( $k, $line ) = each( $output ) )
{
# Valid records begin with hostname:
if( ereg( "^$hostnametMX preference = ([0-9]+), mail exchanger = (.*)$", $line, $parts ) )
{
$mxhosts[ $parts[1] ] = $parts[2];
}
}
if( count( $mxhosts ) )
{
reset( $mxhosts );
ksort( $mxhosts );
$i = 0;
while( list( $pref, $host ) = each( $mxhosts ) )
{
$mxhosts2[$i] = $host;
$i++;
}
$mxhosts = $mxhosts2;
return true;
}
else
{
return false;
}
}
}
?>
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Usage Example
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<?php
if ( getmxrr_winNT( "dataactive.co.uk", $hosts ) )
{
echo $hosts[0];
}
# Prints: mail.mmsc.co.uk
?>
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