$fpdf->SetXY(15,52);
$fpdf->SetFont('Arial', 'B', 13);
$fpdf->SetTextColor(8,8,8 );
$fpdf->Cell(135, 0, utf8_decode('Empresa: ' . $_SESSION['el_nombre_empresa']), 0, 0, 'L');
$fpdf->SetXY(15,52);
$fpdf->SetFont('Arial', 'B', 13);
$fpdf->SetTextColor(8,8,8 );
$fpdf->Cell(135, 0, utf8_decode(<?php "hola mundo"; ?>), 0, 0, 'L');