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I'm not sure I undestand your question...
$music_choice = $_POST['music_choice']; $qryupdate = "Update event_details set ".$music_choice."='$song_id' where user_id='".$_SESSION['oml_user_id']."'"; echo $qryupdate;
btw THIS IS NOT GOOD PROGRAMMING because you should escape your variables before insert them in a SQL query using function like http://php.net/manual/en/function.mysql-real-escape-string.php