How to read port 3389 in php

Example, php obtains system port 3389 information.

// bbs.it-home.org Programmer's Home Collection
$regkey = 'HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlTerminal ServerWdsrdpwdTdstcpPortNumber';
$shell = new COM('WScript.Shell');
var_dump ($shell->RegRead($regkey));
?>