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

class FPDF_CellFit extends FPDF
{
    //Cell with horizontal scaling if text is too wide
    function CellFit($w, $h=0, $txt='', $border=0, $ln=0, $align='', $fill=false, $link='', $scale=false, $force=true)
    {
        //Get string width
        $str_width=$this->GetStringWidth($txt);

        //Calculate ratio to fit cell
        if($w==0)
            $w = $this->w-$this->rMargin-$this->x;
        $ratio = ($w-$this->cMargin*2)/$str_width;

        $fit = ($ratio < 1 || ($ratio > 1 && $force));
        if ($fit)
        {
            if ($scale)
            {
                //Calculate horizontal scaling
                $horiz_scale=$ratio*100.0;
                //Set horizontal scaling
                $this->_out(sprintf('BT %.2F Tz ET', $horiz_scale));
            }
            else
            {
                //Calculate character spacing in points
                $char_space=($w-$this->cMargin*2-$str_width)/max(strlen($txt)-1, 1)*$this->k;
                //Set character spacing
                $this->_out(sprintf('BT %.2F Tc ET', $char_space));
            }
            //Override user alignment (since text will fill up cell)
            $align='';
        }

        //Pass on to Cell method
        $this->Cell($w, $h, $txt, $border, $ln, $align, $fill, $link);

        //Reset character spacing/horizontal scaling
        if ($fit)
            $this->_out('BT '.($scale ? '100 Tz' : '0 Tc').' ET');
    }

    //Cell with horizontal scaling only if necessary
    function CellFitScale($w, $h=0, $txt='', $border=0, $ln=0, $align='', $fill=false, $link='')
    {
        $this->CellFit($w, $h, $txt, $border, $ln, $align, $fill, $link, true, false);
    }

    //Cell with horizontal scaling always
    function CellFitScaleForce($w, $h=0, $txt='', $border=0, $ln=0, $align='', $fill=false, $link='')
    {
        $this->CellFit($w, $h, $txt, $border, $ln, $align, $fill, $link, true, true);
    }

    //Cell with character spacing only if necessary
    function CellFitSpace($w, $h=0, $txt='', $border=0, $ln=0, $align='', $fill=false, $link='')
    {
        $this->CellFit($w, $h, $txt, $border, $ln, $align, $fill, $link, false, false);
    }

    //Cell with character spacing always
    function CellFitSpaceForce($w, $h=0, $txt='', $border=0, $ln=0, $align='', $fill=false, $link='')
    {
        //Same as calling CellFit directly
        $this->CellFit($w, $h, $txt, $border, $ln, $align, $fill, $link, false, true);
    }
}
?>

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

$txt_short = 'This text is short enough.';
$txt_long = 'This text is way too long.';
for ($i = 1; $i <= 2; $i++)
    $txt_long.=' '.$txt_long;

$pdf = new FPDF_CellFit();
$pdf->AddPage();
$pdf->SetFillColor(0xff, 0xff, 0x99);

$pdf->SetFont('Arial', 'B', 16);
$pdf->Write(10, 'Cell');
$pdf->SetFont('');
$pdf->Ln();
$pdf->Cell(0, 10, $txt_short, 1, 1);
$pdf->Cell(0, 10, $txt_long, 1, 1);
$pdf->Ln(20);

$pdf->SetFont('', 'B');
$pdf->Write(10, 'CellFitScale');
$pdf->SetFont('');
$pdf->Write(10, ' (horizontal scaling only if necessary)');
$pdf->Ln();
$pdf->CellFitScale(0, 10, $txt_short, 1, 1);
$pdf->CellFitScale(0, 10, $txt_long, 1, 1, '', 1);
$pdf->Ln();

$pdf->SetFont('', 'B');
$pdf->Write(10, 'CellFitScaleForce');
$pdf->SetFont('');
$pdf->Write(10, ' (horizontal scaling always)');
$pdf->Ln();
$pdf->CellFitScaleForce(0, 10, $txt_short, 1, 1, '', 1);
$pdf->CellFitScaleForce(0, 10, $txt_long, 1, 1, '', 1);
$pdf->Ln(20);

$pdf->SetFont('', 'B');
$pdf->Write(10, 'CellFitSpace');
$pdf->SetFont('');
$pdf->Write(10, ' (character spacing only if necessary)');
$pdf->Ln();
$pdf->CellFitSpace(0, 10, $txt_short, 1, 1);
$pdf->CellFitSpace(0, 10, $txt_long, 1, 1, '', 1);
$pdf->Ln();

$pdf->SetFont('', 'B');
$pdf->Write(10, 'CellFitSpaceForce');
$pdf->SetFont('');
$pdf->Write(10, ' (character spacing always)');
$pdf->Ln();
$pdf->CellFitSpaceForce(0, 10, $txt_short, 1, 1, '', 1);
$pdf->CellFitSpaceForce(0, 10, $txt_long, 1, 1, '', 1);

$pdf->Output();
?>