Untitled

<?php
error_reporting(E_ALL & ~E_NOTICE);

$name = $_GET['name'];
$price = $_GET['price'];
$amount = $_GET['amount'];
$percent = $_GET['percent'];
$period = $_GET['period'];
$sum = $price * $amount;

?>
<div align="left">
<form method="get">
	Shareholder name: <br><input type="text" name="name" value="<?php echo $name; ?>"><br>
	Price: <br><input type="text" name="price" value="<?php echo $price; ?>"><br>
	Amount: <br><input type="text" name="amount" value="<?php echo $amount; ?>"><br>
	Growth per year (%): <br><input type="text" name="percent" value="<?php echo $percent; ?>"><br>
	Period (Years): <br><input type="text" name="period" value="<?php echo $period; ?>"><br>
	<input type="submit" value="Calculate">
</form>
</div>

<?php
$sumst=$sum;
$percent=$percent * 0.01;
$sum1=$sum;
if(isset($name) and is_numeric($price) and is_numeric($amount) and is_numeric($percent) and is_numeric($period)){
	echo "<table border=\"1\" bordercolor=\"green\" bgcolor=\"#F0FFF0\">";
	echo "<th>Year</th>";
	echo "<th>Sum</th>";
	echo "<th>Difference from previous year</th>";
	echo "<th>Difference from start</th>";
	echo "<th>Difference from previous difference (just because)</th>";
	echo "<tr>";
	echo "<td>0</td>";
	echo "<td>".$sum."</td>";
	echo "<td>-</td>";
	echo "<td>-</td>";
	echo "<td>-</td>";
	for($i=1; $i<=$period; $i++){
		$sum2 = $sum;
		echo "<tr>";
		//Year number
		echo "<td>".$i."</td>";
		//Sum calculation
		$sum = $sum + $percent * $sum;
		echo "<td>".$sum."</td>";
		//Difference from previous year
		$difprev2 = $difprev;
		$difprev=$sum-$sum2;
		echo "<td>".$difprev."</td>";
		//Difference from start
		$difst = $sum - $sum1;
		echo "<td>".$difst."</td>";
		//Difference from previous difference
		$difdif = $difprev - $difprev2;
		echo "<td>".$difdif."</td>";
	}
	echo "</tr>";
	echo "</table>";
	echo "<br>";
}
else{
	echo "<font size=\"20\" color=\"#900020\" font-size:large>Please fill in all fields.</font>";
}
?>

 <html>
  <head>
    <script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
    <script type="text/javascript">
      google.charts.load('current', {'packages':['corechart']});
      google.charts.setOnLoadCallback(drawChart);

      function drawChart() {
        var data = new google.visualization.DataTable();
		data.addColumn('number', 'Year');
		data.addColumn('number', 'Sum');
		data.addRows([
			[0, <?php echo $sumst; ?>],
		<?php
		for ($i=1; $i<=$period; $i++){
			$sumst = $sumst * $percent + $sumst;
			echo "[".$i.", ".$sumst."],";
		}
        ?>
		]);

        var options = {
          title: '<?php echo $name; ?>',
		  subtitle: 'Investment calculator',
          curveType: 'function',
          legend: { position: 'bottom' }
        };

        var chart = new google.visualization.LineChart(document.getElementById('curve_chart'));

        chart.draw(data, options);
      }
    </script>
  </head>
  <body>
    <div id="curve_chart" style="width: 900px; height: 500px"></div>
  </body>
</html>