Division by zero error with FPDF + WriteHTML add-on - php

Question

I am trying to use FPDF to generate at PDF file, this is my first time attempting it.
I have the latest FPDF files and have also set up the WriteHTML add-on. The below code is working up until the WriteHTML part at the very bottom. I am getting the error "Warning: Division by zero in /home4/fwall/public_html/fpdf/fpdf.php on line 796". When I look at line 796 of the FPDF.php, I find this:
// Output text in flowing mode
$cw = &$this->CurrentFont['cw'];
$w = $this->w-$this->rMargin-$this->x;
$wmax = ($w-2*$this->cMargin)*1000/$this->FontSize; // <--LINE 796
$s = str_replace("\r",'',$txt);
$nb = strlen($s);
$sep = -1;
$i = 0;
$j = 0;
$l = 0;
$nl = 1;
If I add a conditional statement, along the lines of:
if ($this->FontSize != 0) {
$wmax = ($w-2*$this->cMargin)*1000/$this->FontSize; // <--LINE 796
}
I can get the error to go away, but I know that can't be correct. Does anyone see an error in my code that would cause this?
require ('/home4/fwall/public_html/fpdf/fpdf.php');
//create a FPDF object
$pdf=new FPDF();
$pdfhtml=new PDF_HTML();
//set document properties
$pdf->SetAuthor('Author Name');
$pdf->SetTitle('PRESS RELEASE - NAME OF SHOW');
//set font for the entire document
$pdf->SetFont('Helvetica','B',10);
$pdf->SetTextColor(0,0,0);
//set up a page
$pdf->AddPage('P');
$pdf->SetDisplayMode(real,'default');
//display the top block
$contact = 'Contact Name';
$addline1 = '4002 2nd Ave NE, #2';
$addline2 = 'Address Line 2';
$cityzip = 'Seattle, WA 98105';
$pdf->Cell(0, 4, 'PRESS RELEASE', 0, 0, 'L');
$pdf->Cell(0, 4, 'FOR IMMEDIATE RELEASE', 0, 1, 'R');
$pdf->Cell(0, 4, 'CONTACT: '.$contact, 0, 0, 'L');
$pdf->Cell(0, 4, 'KILL DATE: August 1, 2014', 0, 1, 'R');
$pdf->Cell(0, 4, $addline1, 0, 1, 'L');
$pdf->Cell(0, 4, $addline2, 0, 1, 'L');
$pdf->Cell(0, 4, $cityzip, 0, 1, 'L');
//display the title
$pdf->SetFontSize(20);
$pdf->Cell(0,10,'PRESS RELEASE TITLE',0,1,'C',0);
//display the sub-title
$pdf->SetFontSize(16);
$pdf->Cell(0,10,'The Subtitle',0,1,'C',0);
//display the italic summary
$pdf->SetXY(10,55);
$pdf->SetFont('Helvetica','I',10);
$summary = 'SEATTLE - Theatre Off Jackson presents SPF 8, the annual exhibition of solo performance. Featuring four featured performers and one shorts night, the festival will occur between February 6th and March 1st, 2014. This year\'s festival is an exciting mix of experienced artists and new-comers with exciting stories to tell. From tales of a ten-day vows of silence to what it\'s like growing up with deaf parents and siblings, this year\'s festival is a potpourri of styles and stories.';
$pdf->MultiCell(0, 4, $summary , 0, 'J');
//display the main content
$pdf->SetFont('Helvetica','',10);
$maincontent = '
First line.
Second Line?
<ul>
<li>
Item 1
</li>
</ul>
';
$pdfhtml->WriteHTML($maincontent);
//Output the document
$pdf->Output('example1.pdf','I');

Answer 1

The WriteHTML add-on is a class called PDF_HTML which extends the original FPDF. To use the add-on functionality you have to instantiate the subclass and use it:
$pdfhtml=new PDF_HTML();
You don't need the additional instance ($pdf) of the parent class. Remove it and change all references of $pdf to $pdfhtml and you are good to go:
<?php
define('FPDF_FONTPATH', '../Classes/FPDF/font/');
require ('../Classes/FPDF/fpdf.php');
require ('writeHtml.php');
//create a PDF_HTML object
$pdfhtml=new PDF_HTML();
//set document properties
$pdfhtml->SetAuthor('Author Name');
$pdfhtml->SetTitle('PRESS RELEASE - NAME OF SHOW');
//set font for the entire document
$pdfhtml->SetFont('Helvetica','B',10);
$pdfhtml->SetTextColor(0,0,0);
//set up a page
$pdfhtml->AddPage('P');
// $pdfhtml->SetDisplayMode(real,'default'); //<-- commented this line, what is real?
//display the top block
$contact = 'Contact Name';
$addline1 = '4002 2nd Ave NE, #2';
$addline2 = 'Address Line 2';
$cityzip = 'Seattle, WA 98105';
$pdfhtml->Cell(0, 4, 'PRESS RELEASE', 0, 0, 'L');
$pdfhtml->Cell(0, 4, 'FOR IMMEDIATE RELEASE', 0, 1, 'R');
$pdfhtml->Cell(0, 4, 'CONTACT: '.$contact, 0, 0, 'L');
$pdfhtml->Cell(0, 4, 'KILL DATE: August 1, 2014', 0, 1, 'R');
$pdfhtml->Cell(0, 4, $addline1, 0, 1, 'L');
$pdfhtml->Cell(0, 4, $addline2, 0, 1, 'L');
$pdfhtml->Cell(0, 4, $cityzip, 0, 1, 'L');
//display the title
$pdfhtml->SetFontSize(20);
$pdfhtml->Cell(0,10,'PRESS RELEASE TITLE',0,1,'C',0);
//display the sub-title
$pdfhtml->SetFontSize(16);
$pdfhtml->Cell(0,10,'The Subtitle',0,1,'C',0);
//display the italic summary
$pdfhtml->SetXY(10,55);
$pdfhtml->SetFont('Helvetica','I',10);
$summary = 'SEATTLE - Theatre Off Jackson presents SPF 8, the annual exhibition of solo performance. Featuring four featured performers and one shorts night, the festival will occur between February 6th and March 1st, 2014. This year\'s festival is an exciting mix of experienced artists and new-comers with exciting stories to tell. From tales of a ten-day vows of silence to what it\'s like growing up with deaf parents and siblings, this year\'s festival is a potpourri of styles and stories.';
$pdfhtml->MultiCell(0, 4, $summary , 0, 'J');
//display the main content
$pdfhtml->SetFont('Helvetica','',10);
$maincontent = '
First line.
Second Line?
<ul>
<li>
Item 1
</li>
</ul>
';
$pdfhtml->WriteHTML($maincontent);
//Output the document
$pdfhtml->Output('example1.pdf','I');
Note that I changed the include paths on top. I also commented the line where you call SetDisplayMode.

Answer 2

You might have some elemets such as got unbalanced in your pdf html. Some elements might not have been closed or started.
It cost me 2 days to find this issue.