QR CODE

add_filter('em_booking_output_placeholder','my_em_generate_barcode',1,3);
function my_em_generate_barcode($replacement, $EM_Booking, $result){
    global $wpdb;
    if (is_object($EM_Booking)) {
        if ($result == '#_BOOKINGBARCODE') {
            $sql = $wpdb->prepare( "SELECT transaction_gateway_id FROM ".EM_TRANSACTIONS_TABLE." WHERE booking_id= '".$EM_Booking->booking_id."' ");
            $txn_id = $wpdb->get_var($sql);
            $size = "200x200";
            $content = $txn_id;
            $replacement = "<img src='http://chart.apis.google.com/chart?cht=qr&chs=".$size."&chl=".$content."&chld=H|0' />";
        }
    }

    return $replacement;
}