ช่วยดูโค๊ดให้หน่อยครับ รับค่าจาก database มาพอตกราฟ

<?php

session_start();
$host="127.0.0.1";
$user="root";
$passwd="admin";
$dbname="pchart";
$sql = "SELECT*FROM chart WHERE type='$type' AND amount='$amount'";

  include("pChart/pData.class");   
  include("pChart/pChart.class");   
 
 
  $DataSet = new pData;   
  $DataSet->AddPoint(array(amount),"amount");
  $DataSet->AddPoint(array(type),"type");
  $DataSet->AddSerie("amount");   
  $DataSet->SetAbsciseLabelSerie("type");   
  $DataSet->SetYAxisName("amount");
  $DataSet->SetYAxisUnit("units");
 
    
  $Graph = new pChart(700,230);   
  $Graph->setFontProperties("Fonts/tahoma.ttf",8);   
  $Graph->setGraphArea(70,30,680,200);   
  $Graph->drawFilledRoundedRectangle(7,7,693,223,5,240,240,240);   
  $Graph->drawRoundedRectangle(5,5,695,225,5,230,230,230);   
  $Graph->drawGraphArea(255,255,255,TRUE);
  $Graph->drawScale($DataSet->GetData(),$DataSet->GetDataDescription(),SCALE_NORMAL,150,150,150,TRUE,0,2);   
  $Graph->drawGrid(4,TRUE,230,230,230,50);
 
  
  $Graph->setFontProperties("Fonts/tahoma.ttf",6);   
  $Graph->drawTreshold(0,143,55,72,TRUE,TRUE);   
 

  $Graph->drawLineGraph($DataSet->GetData(),$DataSet->GetDataDescription());   
  $Graph->drawPlotGraph($DataSet->GetData(),$DataSet->GetDataDescription(),3,2,255,255,255);   
 
   
  $Graph->setFontProperties("Fonts/tahoma.ttf",8);   
  $Graph->drawLegend(75,35,$DataSet->GetDataDescription(),255,255,255);   
  $Graph->setFontProperties("Fonts/tahoma.ttf",10);   
  $Graph->drawTitle(60,22,"Computer store",50,50,50,585);   
  $Graph->Stroke("example1.png");      
 ?>