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;
}

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. :)