Example using FPDF and the FPDI Classes:
function PlaceWatermark($file, $text, $xxx, $yyy, $op, $outdir) {
require_once('fpdf.php');
require_once('fpdi.php');
$name = uniqid();
$font_size = 5;
$ts=explode("\n",$text);
$width=0;
foreach ($ts as $k=>$string) {
$width=max($width,strlen($string));
}
$width = imagefontwidth($font_size)*$width;
$height = imagefontheight($font_size)*count($ts);
$el=imagefontheight($font_size);
$em=imagefontwidth($font_size);
$img = imagecreatetruecolor($width,$height);
// Background color
$bg = imagecolorallocate($img, 255, 255, 255);
imagefilledrectangle($img, 0, 0,$width ,$height , $bg);
// Font color
$color = imagecolorallocate($img, 0, 0, 0);
foreach ($ts as $k=>$string) {
$len = strlen($string);
$ypos = 0;
for($i=0;$i<$len;$i++){
$xpos = $i * $em;
$ypos = $k * $el;
imagechar($img, $font_size, $xpos, $ypos, $string, $color);
$string = substr($string, 1);
}
}
imagecolortransparent($img, $bg);
$blank = imagecreatetruecolor($width, $height);
$tbg = imagecolorallocate($blank, 255, 255, 255);
imagefilledrectangle($blank, 0, 0,$width ,$height , $tbg);
imagecolortransparent($blank, $tbg);
if ( ($op < 0) OR ($op >100) ){
$op = 100;
}
imagecopymerge($blank, $img, 0, 0, 0, 0, $width, $height, $op);
imagepng($blank,$name.".png");
// Created Watermark Image
$pdf = new FPDI();
if (file_exists("./".$file)){
$pagecount = $pdf->setSourceFile($file);
} else {
return FALSE;
}
$tpl = $pdf->importPage(1);
$pdf->addPage();
$pdf->useTemplate($tpl, 1, 1, 0, 0, TRUE);
//Put the watermark
$pdf->Image($name.'.png', $xxx, $yyy, 0, 0, 'png');
if ($outdir === TRUE){
return $pdf->Output();
} else {
return $pdf;
}
}
PlaceWatermark("filename.pdf", "This is a lazy, but still simple test\n This should stand on a new line!", 30, 120, 100,TRUE);
Usage: PlaceWatermark($filename, $text, $x, $y, $opacity, $directoutput);
$filename – The path of the PDF in which you want to put the Watermark
$text – The Watermark text you want to add
$x – x coordinate where you want to put the Watermark
$y – y coordinate where you want to put the Watermark
$opacity – Opacity of the text
$directoutput – If TRUE function will output a PDF File, else it will return the $pdf
Note:- the above code is for only one page.You can add watermark to more pages using the loop mentioned below.
for($i=1; $i <= $pagecount; $i++) {
$tpl = $pdf->importPage($i);
$pdf->addPage();
$pdf->useTemplate($tpl, 1, 1, 0, 0, TRUE);
//Put the watermark
$pdf->Image($name.'.png', $xxx, $yyy, 0, 0, 'png');}
Modify it according to your wish...n cheers!!! :)
Here is solution for your problem:
Article URL: http://sanjoyinfoworld.blogspot.com/2012/08/create-watermark-for-pdf-using-php.html
Library Manual: http://mpdf1.com/manual/index.php?tid=242&searchstring=Watermarks
