Table with multi-page columns

<?php
require('fpdf.php');

class PDF extends FPDF {

public $tablewidths;
public $footerset;

function _beginpage($orientation, $size, $rotation) {
    $this->page++;
    if(!isset($this->pages[$this->page])) // solves the problem of overwriting a page if it already exists
    {
        $this->pages[$this->page] = '';
        $this->PageLinks[$this->page] = array();
    }
    $this->state = 2;
    $this->x = $this->lMargin;
    $this->y = $this->tMargin;
    $this->FontFamily = '';
    // Check page size and orientation
    if($orientation=='')
        $orientation = $this->DefOrientation;
    else
        $orientation = strtoupper($orientation[0]);
    if($size=='')
        $size = $this->DefPageSize;
    else
        $size = $this->_getpagesize($size);
    if($orientation!=$this->CurOrientation || $size[0]!=$this->CurPageSize[0] || $size[1]!=$this->CurPageSize[1])
    {
        // New size or orientation
        if($orientation=='P')
        {
            $this->w = $size[0];
            $this->h = $size[1];
        }
        else
        {
            $this->w = $size[1];
            $this->h = $size[0];
        }
        $this->wPt = $this->w*$this->k;
        $this->hPt = $this->h*$this->k;
        $this->PageBreakTrigger = $this->h-$this->bMargin;
        $this->CurOrientation = $orientation;
        $this->CurPageSize = $size;
    }
    if($orientation!=$this->DefOrientation || $size[0]!=$this->DefPageSize[0] || $size[1]!=$this->DefPageSize[1])
        $this->PageInfo[$this->page]['size'] = array($this->wPt, $this->hPt);
    if($rotation!=0)
    {
        if($rotation%90!=0)
            $this->Error('Incorrect rotation value: '.$rotation);
        $this->PageInfo[$this->page]['rotation'] = $rotation;
    }
    $this->CurRotation = $rotation;
}

function Footer() {
    // Check if Footer for this page already exists (do the same for Header())
    if(!isset($this->footerset[$this->page])) {
        $this->SetY(-15);
        // Page number
        $this->Cell(0,10,'Page '.$this->PageNo().'/{nb}',0,0,'C');
        // set footerset
        $this->footerset[$this->page] = true;
    }
}

function morepagestable($datas, $lineheight=8) {
    // some things to set and 'remember'
    $l = $this->lMargin;
    $startheight = $h = $this->GetY();
    $startpage = $currpage = $maxpage = $this->page;

    // calculate the whole width
    $fullwidth = 0;
    foreach($this->tablewidths AS $width) {
        $fullwidth += $width;
    }

    // Now let's start to write the table
    foreach($datas AS $row => $data) {
        $this->page = $currpage;
        // write the horizontal borders
        $this->Line($l,$h,$fullwidth+$l,$h);
        // write the content and remember the height of the highest col
        foreach($data AS $col => $txt) {
            $this->page = $currpage;
            $this->SetXY($l,$h);
            $this->MultiCell($this->tablewidths[$col],$lineheight,$txt);
            $l += $this->tablewidths[$col];

            if(!isset($tmpheight[$row.'-'.$this->page]))
                $tmpheight[$row.'-'.$this->page] = 0;
            if($tmpheight[$row.'-'.$this->page] < $this->GetY()) {
                $tmpheight[$row.'-'.$this->page] = $this->GetY();
            }
            if($this->page > $maxpage)
                $maxpage = $this->page;
        }

        // get the height we were in the last used page
        $h = $tmpheight[$row.'-'.$maxpage];
        // set the "pointer" to the left margin
        $l = $this->lMargin;
        // set the $currpage to the last page
        $currpage = $maxpage;
    }
    // draw the borders
    // we start adding a horizontal line on the last page
    $this->page = $maxpage;
    $this->Line($l,$h,$fullwidth+$l,$h);
    // now we start at the top of the document and walk down
    for($i = $startpage; $i <= $maxpage; $i++) {
        $this->page = $i;
        $l = $this->lMargin;
        $t  = ($i == $startpage) ? $startheight : $this->tMargin;
        $lh = ($i == $maxpage)   ? $h : $this->h-$this->bMargin;
        $this->Line($l,$t,$l,$lh);
        foreach($this->tablewidths AS $width) {
            $l += $width;
            $this->Line($l,$t,$l,$lh);
        }
    }
    // set it to the last page, if not it'll cause some problems
    $this->page = $maxpage;
}
}
?>

<?php
require('morepagestable.php');

function GenerateWord()
{
    // Get a random word
    $nb = rand(3,10);
    $w = '';
    for($i=1;$i<=$nb;$i++)
        $w .= chr(rand(ord('a'),ord('z')));
    return $w;
}

function GenerateSentence($words=500)
{
    // Get a random sentence
    $nb = rand(20,$words);
    $s = '';
    for($i=1;$i<=$nb;$i++)
        $s .= GenerateWord().' ';
    return substr($s,0,-1);
}

$pdf = new PDF('P','pt');
$pdf->AliasNbPages();
$pdf->AddPage();
$pdf->SetFont('Arial','B',12);
$pdf->MultiCell(0,20,'Example to build a table over more than one page');
$pdf->SetFont('Arial','',6);
$pdf->tablewidths = array(90, 90, 90, 90, 90, 90);
for($i=0;$i<4;$i++) {
    $data[] = array(GenerateSentence(), GenerateSentence(), GenerateSentence(), GenerateSentence(), GenerateSentence(), GenerateSentence());
}
$pdf->morepagestable($data);
$pdf->Output();
?>