problem2.php

<?php
require('fpdf.php');
class PDF extends FPDF

function WriteHTML($sum)
{
    // HTML parser
    $sum = str_replace("\n",' ',$sum);
    $a = preg_split('/<(.*)>/U',$sum,-1,PREG_SPLIT_DELIM_CAPTURE);
    foreach($a as $i=>$e)
    {
        if($i%2==0)
        {
            // Text
            if($this->HREF)
                $this->PutLink($this->HREF,$e);
            else
                $this->Write(5,$e);
        }
        else
        {
            // Tag
            if($e[0]=='/')
                $this->CloseTag(strtoupper(substr($e,1)));
            else
            {
                // Extract attributes
                $a2 = explode(' ',$e);
                $tag = strtoupper(array_shift($a2));
                $attr = array();
                foreach($a2 as $v)
                {
                    if(preg_match('/([^=]*)=["\']?([^"\']*)/',$v,$a3))
                        $attr[strtoupper($a3[1])] = $a3[2];
                }
                $this->OpenTag($tag,$attr);
            }
        }
    }
}

$sum = 1+2;

$pdf = new PDF();
$pdf->AddPage();
$pdf->SetFont('Arial','B',16);
WriteHTML((string)$sum);
$pdf->Output();
?>