PHP

How to add watermark in FPDF PHP - Parte 1

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

class PDF_Rotate extends FPDF
{
var $angle=0;

function Rotate($angle,$x=-1,$y=-1)
{
    if($x==-1)
        $x=$this->x;
    if($y==-1)
        $y=$this->y;
    if($this->angle!=0)
        $this->_out('Q');
    $this->angle=$angle;
    if($angle!=0)
    {
        $angle*=M_PI/180;
        $c=cos($angle);
        $s=sin($angle);
        $cx=$x*$this->k;
        $cy=($this->h-$y)*$this->k;
        $this->_out(sprintf('q %.5F %.5F %.5F %.5F %.2F %.2F cm 1 0 0 1 %.2F %.2F cm',$c,$s,-$s,$c,$cx,$cy,-$cx,-$cy));
    }
}

function _endpage()
{
    if($this->angle!=0)
    {
        $this->angle=0;
        $this->_out('Q');
    }
    parent::_endpage();
}
}
?>

How to add watermark in FPDF PHP - Parte 2

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

class PDF extends PDF_Rotate
{
function Header()
{
    /* Put the watermark */
    $this->SetFont('Arial','B',50);
    $this->SetTextColor(255,192,203);
    $this->RotatedText(35,190,'W a t e r m a r k   d e m o',45);
}

function RotatedText($x, $y, $txt, $angle)
{
    /* Text rotated around its origin */
    $this->Rotate($angle,$x,$y);
    $this->Text($x,$y,$txt);
    $this->Rotate(0);
}
}

$pdf=new PDF();
$pdf->AddPage();
$pdf->SetFont('Arial','',12);
$txt="FPDF is a PHP class which allows to generate PDF files with pure PHP, that is to say ".
    "without using the PDFlib library. F from FPDF stands for Free: you may use it for any ".
    "kind of usage and modify it to suit your needs.

";
for($i=0;$i<25;$i++) 
    $pdf->MultiCell(0,5,$txt,0,'J');
$pdf->Output();
?>