It looks like after getmxrr() became an alias to dns_get_mx(), it doesn't understand that the second and third arguments are forced references.  Consider the following example.

<?
	//OK
	dns_get_mx("netscape.com", $mxrecord1, $weight1);
	print_r($mxrecord1);
	
	//Notices about mxrecord2 and weight being undefined
	//and no data returned
	getmxrr("netscape.com", $mxrecord2, $weight2);
	print_r($mxrecord2);
?>


In 4.3, getmxrr() behaves correctly.  I'm guessing that that ext/standard/basic_functions.c needs a tweak to force the arguments to be references, but I'm not familiar enough with the PHP_FE/PHP_FALIAS macros to fix come up with a fix.

Thanks,
Leon