Fatal error: Call to undefined function getmxrr()
The following message is generated when a PHP file (or one containing
PHP) is viewed:
Fatal error: Call to undefined function: getmxrr() in D:\some\directory\some_file.php
on line NNN
The actual directory given will vary. "NNN" identifies the line number
in the file where the error originated.
The function "getmxrr" returns MX records corresponding to a given Internet
host name. It is not implemented on Windows platforms (true for PHP up to
and including 4.3 and possibly later versions as well.)
For further details and possible work around see
These notes are believed to be correct for PHP 4.3 running
on Windows Server 2003 and may apply to other versions as well.
About the author: Brian Cryer
is a dedicated software developer and webmaster. For his day job he develops websites and desktop applications as well as providing IT services. He moonlights as a technical author and consultant.