error generate pdf - PHP - php

Question

This have been bugging me for a few hours. When i try to produce pdf, i got this error:
1) Warning: Division by zero in C:\xampp\htdocs\KPAPMS\PHP\lib\pdftable.php on line 540
2) FPDF error: Some data has already been output, can't send PDF file
i just use the existing code to generate pdf(fpdf).
this is my code example
<?php
$sql = "SELECT * from vesservice";
$res = mysql_query($sql);
$hdd= "<table width=100%>
<tr><th width=100><strong>Company</strong></th><th><strong>: Kuching Port Authority</strong></th><th></th>
<th>Date / Time: ".$date."</th></tr>
<tr><th width=100><strong>Title</strong></th><th><strong>: Water Supply for SCN</strong></th><th></th><th></th></tr>
<tr><th colspan=4><hr></th></tr>
<tr>
<th><strong>SCN</strong></th><th>:</th>
<th><strong>Berth Date</strong></th><th>:</th></tr>
<tr>
<th><strong>Debtor Code</strong></th><th>:</th>
<th><strong>Expected Depart Date / Time</strong></th><th>:</th></tr>
<tr>
<th></th><th></th>
<th><strong>Actual Depart Date / Time</strong></th><th>:</th></tr>
<tr><th colspan=4><hr></th></tr>
</table>";
$tables="<table width=100%>
<tr align=center>
<th>Service Reference</th>
<th>Service Code</th>
<th>Water Supply Reference</th>
<th>Water Supply Sequence</th>
<th>Tariff Code</th>
<th>Tariff Description</th>
<th>UOM</th>
<th>Service Date</th>
<th>Requested Time</th>
<th>Volume<br />(Tonne)</th>
<th>Service Date</th>
<th>Started Time</th>
<th>Volume<br />(Tonne)</th>
<th>Service Date</th>
<th>Ended Date</th>
<th>Duration</th></tr>";
while($rs=mysql_fetch_assoc($res))
{
$tables.= "<tr align=center>
<td>".$rs['serv_opt']."</td>
<td>".$rs['dt_code']."</td>
<td>".$rs['scn']."</td>
<td>".$rs['term_code']."</td>
<td>".$rs['serv_cat']."</td>
<td>".$rs['serv_code']."</td>
<td>".$rs['activ_cnt']."</td>
<td>".$rs['serv_date_req']."</td>
<td>".$rs['serv_shift_req']."</td>
<td>".$rs['serv_qty']."</td>
<td>".$rs['serv_ref']."</td>
<td>".$rs['res_serv_date']."</td>
<td>".$rs['res_serv_time']."</td>
<td>".$rs['new_serv_date']."</td>
<td>".$rs['new_serv_time']."</td>
<td>".$rs['new_serv_qty']."</td>
</tr>";
}
$tables.="</table>";
//echo $hdd.'<br />'.$tables;
$p = new PDFTable('L','mm','a4');//set page orientation P/L
$p->SetFont('Times','',10);
$p->headerTable=$hdd;
$p->AddPage();
$p->htmltable($tables);
//ob_end_clean();
$p->output("Water Supply.pdf",'I'); //D=download
When i uncommet the ob_end_clean, it can generate the pdf output, but only print $tables but the header is not printed.
Please help me, which part i did wrong.

Answer 1

You can try insert ob_end_clean(); before outputing.
Example
<?php
require('fpdf.php');
$pdf = new FPDF();
//your code for eneration of the pdf
ob_end_clean();
$pdf->Output();
?>

Answer 2

Ok if you want FPdf to work properly, there cannot be any output at all beside what fpdf generates. You can solve the problem deleting all new line characters found at the end of the .php files, using the following regular expression
\?>\n\z
replaced with
\?\n
For example:
<?php
$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'Ok, OK
$pdf->Output();
?>
But this won't work
<?php
echo "You don't sent before output";
$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
$pdf->Cell(40,10,'OK oK);
$pdf->Output();
?>