revealability

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<?php

if(!isset($_SESSION)) 
{ 
        session_start(); 
} 
// functions.php
function check_txnid($tnxid){
	global $link;
	return true;
	$valid_txnid = true;
	//get result set
	$sql = mysql_query("SELECT * FROM `payments` WHERE txnid = '$tnxid'", $link);
	if ($row = mysql_fetch_array($sql)) {
		$valid_txnid = false;
	}
	return $valid_txnid;
}

function updatePayments($data){
	global $link;

if (is_array($data)) {
		$sql = mysql_query("INSERT INTO `payments` (txnid, payment_amount, payment_status, itemid, createdtime) VALUES (
				'".$data['txn_id']."' ,
				'".$data['payment_amount']."' ,
				'".$data['payment_status']."' ,
				'".$data['item_number']."' ,
				'".date("Y-m-d H:i:s")."'
				)", $link);
		return mysql_insert_id($link);
	}
}