CODE EXAMPLE FOR 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();
}
}
?>