Some data has already been output, can't send PDF file

Question

I'm using fpdf in creating pdf in php and I'm getting this error when running:

Notice: Undefined index: id in C:\xampp1\htdocs\arvin2\public\pdf2\id.php on line 3
FPDF error: Some data has already been output, can't send PDF file

This is my php code (report.php):

<form action="http://localhost/pdf2/id.php" method="post" target="_blank">
<input type="text" name="id">
<input type="submit" name="submitpdf" value="Print"/>
</form>

the other one(eto.php):

<?php
require('mysql_table.php');
$id=$_POST['id'];

class PDF extends PDF_MySQL_Table
{
function Header()
{
//Title
$this->SetFont('Arial','',18);
$this->Cell(0,6,'Type of Leave',0,1,'C');
$this->Ln(10);
//Ensure table header is output
parent::Header();
}
}

mysql_connect('localhost','root','');
mysql_select_db('auth');


$pdf=new PDF();
//First table: put all columns automatically
$pdf->AddPage();
//Second table: specify 3 columns
$pdf->AddCol('leave_id',20,'','C');
$pdf->AddCol('fullname',40,'Fullname');
$pdf->AddCol('type_of_leave',40,'Type of Leave','R');
$prop=array('HeaderColor'=>array(255,150,100),
        'color1'=>array(210,245,255),
        'color2'=>array(255,255,210),
        'padding'=>2);
$pdf->Table('select leave_id, fullname, type_of_leave from application where     id_no="$_POST[id]"',$prop);
$pdf->Output();

?>

When I put:

if(isset($_POST['submitpdf']))
{
    $id=$_POST['id'];
    //your code goes here
}

The error says:

Parse error: syntax error, unexpected '$pdf' (T_VARIABLE) in C:\xampp1\htdocs\arvin2\public\pdf2\id.php on line 34

The output should be all the info of ID numbers inputted in the text field printed in the pdf form.

Answer 1

put if isset on your code. ie

if(isset($_POST['submitpdf']))
{
//$id=$_POST['id'];
//your code goes here
}

this is to ensure that your code would only run after reading your form-data

EDIT:

your new error i guess comes from the select string.

$pdf->Table('select leave_id, fullname, type_of_leave from application where     id_no="$_POST[id]"',$prop);

change it to this:

$pdf->Table("select leave_id, fullname, type_of_leave from application where id_no=".$_POST[id],$prop);