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my $_result = `php file.php memberid=$_memberid position=left referrer
+=$_referrerid`;

<?php
my $_memberid = $_GET['memberid'] || $_POST['memberid'] || $memberid;
...
echo "I have recieved the MemberID As: $_memberid and the Position as 
+$_position and finally the referring member id is: $_referrerid
";
?>