GetMultiCellHeight() script for FPDF

gistfile1.php

function GetMultiCellHeight($w, $h, $txt, $border=null, $align='J') {
	// Calculate MultiCell with automatic or explicit line breaks height
	// $border is un-used, but I kept it in the parameters to keep the call
	//   to this function consistent with MultiCell()
	$cw = &$this->CurrentFont['cw'];
	if($w==0)
		$w = $this->w-$this->rMargin-$this->x;
	$wmax = ($w-2*$this->cMargin)*1000/$this->FontSize;
	$s = str_replace("\r",'',$txt);
	$nb = strlen($s);
	if($nb>0 && $s[$nb-1]=="\n")
		$nb--;
	$sep = -1;
	$i = 0;
	$j = 0;
	$l = 0;
	$ns = 0;
	$height = 0;
	while($i<$nb)
	{
		// Get next character
		$c = $s[$i];
		if($c=="\n")
		{
			// Explicit line break
			if($this->ws>0)
			{
				$this->ws = 0;
				$this->_out('0 Tw');
			}
			//Increase Height
			$height += $h;
			$i++;
			$sep = -1;
			$j = $i;
			$l = 0;
			$ns = 0;
			continue;
		}
		if($c==' ')
		{
			$sep = $i;
			$ls = $l;
			$ns++;
		}
		$l += $cw[$c];
		if($l>$wmax)
		{
			// Automatic line break
			if($sep==-1)
			{
				if($i==$j)
					$i++;
				if($this->ws>0)
				{
					$this->ws = 0;
					$this->_out('0 Tw');
				}
				//Increase Height
				$height += $h;
			}
			else
			{
				if($align=='J')
				{
					$this->ws = ($ns>1) ? ($wmax-$ls)/1000*$this->FontSize/($ns-1) : 0;
					$this->_out(sprintf('%.3F Tw',$this->ws*$this->k));
				}
				//Increase Height
				$height += $h;
				$i = $sep+1;
			}
			$sep = -1;
			$j = $i;
			$l = 0;
			$ns = 0;
		}
		else
			$i++;
	}
	// Last chunk
	if($this->ws>0)
	{
		$this->ws = 0;
		$this->_out('0 Tw');
	}
	//Increase Height
	$height += $h;

	return $height;
}

Thank you sir! Just found this!

On php 7.1 I had the error "Warning: Illegal string offset 'E'"
in this place
$l += $cw[$c];

Thks

Thanks for the script, but I'm having the same problem as "shklyarik". Sadly, since most variables have cryptic single letter names, it's hard to understand the code and fix the problem. If I just check for the existence of $cw[$c] with isset() to avoid the warnings, then the result is it doesn't calculate the height correctly anyway (all MultiCells are reported as single line height).

I had problems calculating if I use big text. I managed to solve it by removing the line $cw = &$this->CurrentFont['cw'];

I know this may be old but as I used this method, I had an issue on number of chars too. I resolved it by using mb_strlen instead of strlen. It woks prefectly now. Hop this helps and many thanks for the script.

Genius, genius, genius script..

Thank you so much, I've been looking to solve a bug almost 2 weeks and this is the function I needed. Really appreciate it

I really want to try this, but I can't get it to work. Do I put the function is a class like this?:

class PDF extends FPDF {
function GetMultiCellHeight($w,$h,$txt,$border,$align){
...
}
}

and call it like this?:

$multiCellHeight=$pdf->GetMultiCellHeight(4,.2,$description,0,'L');

Thanks,
Eric

voici ma methode, c'est du bidouille, mais elle marche bien
`$w = array(8,60, 15, 25,25); // A5
for($i=0;$i<count($header);$i++)
$this->Cell($w[$i],7,$header[$i],1,0,'C',true);
$this->Ln();
// Restauration des couleurs et de la police
$this->SetFillColor(224,235,255);
$this->SetTextColor(0);
// $this->SetFont('');
// Données
$fill = false;

$tableSize = sizeof($data);
$solde = 0;
$l = 1;
for($i = 0 ; $i<$tableSize; $i ++){
	$solde += intval($data[$i]['montant']);
    $posXX0 = $this->getX();
    $this->Cell($w[0],6,'','LRT',0,'C',$fill);
    $posX0 = $this->getX();
    $posY0 = $this->getY();
    $this->MultiCell($w[1],6,$data[$i]['article'],'LRT',0,'C');
    $posY1 = $this->getY();
    $h=   $posY1 - $posY0;
    
    $this->SetXY($posX0 + $w[1], $posY0);
    $this->Cell($w[2], $h,$data[$i]['quantite'],'LRT',0,'C',$fill);
    $this->Cell($w[3], $h,number_format($data[$i]['prix_vente'], 0, '.', ' '),'LRT',0,'C',$fill);
    $this->Cell($w[4], $h,number_format($data[$i]['montant'], 0, '.', ' '),'LRT',0,'C',$fill);
    $this->SetXY($posXX0, $posY0);
    
    $this->Cell($w[0],$h,$l,'LR',0,'C',$fill);
   // $this->Cell(array_sum($w), 0, '', 'T');
    $this->Ln();
    // $fill = !$fill;
    $l += 1;
}`

Thank you very much, it worked for me, although it served me more as a line break counter or the number of lines that a text could have based on the cell width, just by making this change $height++; so that it only counts the lines.
Alternatively, you can change $height to $lines to avoid confusion. :)