<?php
include('pdqconnect.inc');

$sql = "update PDQMessage set message= '".  mysqli_real_escape_string($mydb,$_POST['newmessage'])  . "'  where PDQMid=0";
$rs=mysqli_query($mydb, $sql) or die(mysqli_error());
if(mysqli_affected_rows($mydb)>0){
	echo "Success";
} else {
	echo "Failure - $sql";
}