5 个答案:

答案 0 :(得分：10)

使用FPDF和FPDI类只是一个快速的例子：

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

$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);

用法：PlaceWatermark($filename, $text, $x, $y, $opacity, $directoutput);

$filename - 要在其中放置水印的PDF路径

$text - 要添加的水印文字

$x - 要在其中放置水印的x坐标

$y - 您想要放置水印的坐标

$opacity - 文字的不透明度

$directoutput - 如果TRUE函数将输出PDF文件，否则它将返回$ pdf

正如我已经说过的，这是一个非常快速和肮脏的例子，它需要一些改进。

答案 1 :(得分：6)

对于偶然发现此帖子的其他人，您可以使用for循环生成更多页面

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');}

答案 2 :(得分：1)

/* index.php */

require('rotation.php');

class PDF extends PDF_Rotate{

protected $_outerText1;// dynamic text

protected $_outerText2;

function setWaterText($txt1="", $txt2=""){

$this->_outerText1 = $txt1;

$this->_outerText2 = $txt2;

}

function Header(){

//Put the watermark

$this->SetFont('Arial','B',40);

$this->SetTextColor(255,192,203);

$this->SetAlpha(0.5);

$this->RotatedText(35,190, $this->_outerText1, 45);

$this->RotatedText(75,190, $this->_outerText2, 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);

}

}

$file = "path/filename.pdf";// path: file name

$pdf = new PDF();

if (file_exists($file)){

$pagecount = $pdf->setSourceFile($file);

} else {

return FALSE;

}

$pdf->setWaterText("w a t e r M a r k d e m o ", "s e c o n d L i n e o f t e x t");

/* loop for multipage pdf */

for($i=1; $i <= $pagecount; $i++) {

$tpl = $pdf->importPage($i);

$pdf->addPage();

$pdf->useTemplate($tpl, 1, 1, 0, 0, TRUE);

}

$pdf->Output(); //specify path filename to save or keep as it is to view in browser

/* rotation.php */

require('fpdf.php');

require('fpdi.php');

class PDF_Rotate extends FPDI

{

var $angle=0;

var $extgstates = array();

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();

}

function SetAlpha($alpha, $bm='Normal')

{

// set alpha for stroking (CA) and non-stroking (ca) operations

$gs = $this->AddExtGState(array('ca'=>$alpha, 'CA'=>$alpha, 'BM'=>'/'.$bm));

$this->SetExtGState($gs);

}

function AddExtGState($parms)

{

$n = count($this->extgstates)+1;

$this->extgstates[$n]['parms'] = $parms;

return $n;

}

function SetExtGState($gs)

{

$this->_out(sprintf('/GS%d gs', $gs));

}

function _enddoc()

{

if(!empty($this->extgstates) && $this->PDFVersion

$this->PDFVersion='1.4';

parent::_enddoc();

}

function _putextgstates()

{

for ($i = 1; $i <= count($this->extgstates); $i++)

{

$this->_newobj();

$this->extgstates[$i]['n'] = $this->n;

$this->_out('<

foreach ($this->extgstates[$i]['parms'] as $k=>$v)

$this->_out('/'.$k.' '.$v);

$this->_out('>>');

$this->_out('endobj');

}

}

function _putresourcedict()

{

parent::_putresourcedict();

$this->_out('/ExtGState <

foreach($this->extgstates as $k=>$extgstate)

$this->_out('/GS'.$k.' '.$extgstate['n'].' 0 R');

$this->_out('>>');

}

function _putresources()

{

$this->_putextgstates();

parent::_putresources();

}

}

从fpdf示例脚本中尝试this.modified脚本。

编辑：添加不透明度使用$ this-＆gt; SetAlpha(0.5)

答案 3 :(得分：1)

感谢Jyelton对我的问题的回答看起来像stackover flow是无效的....

答案 4 :(得分：0)

这是一种MPDF的做法，在面向横向的PDF的每一页上都添加了水印。

//First, get the correct document size.

$mpdf = new \Mpdf\Mpdf([

'tempDir' => storage_path('app'),

'orientation' => 'L'

]);

$pagecount = $mpdf->SetSourceFile('[path]');

$tplId = $mpdf->ImportPage(1);

$size = $mpdf->getTemplateSize($tplId);

//Open a new instance with specified width and height, read the file again

$mpdf = new \Mpdf\Mpdf([

'tempDir' => storage_path('app'),

'format' => [$size['width'], $size['height']]

]);

$mpdf->SetSourceFile('[path]');

//Write into the instance and output it

for ($i=1; $i <= $pagecount; $i++) {

$tplId = $mpdf->ImportPage($i);

$mpdf->addPage();

$mpdf->UseTemplate($tplId);

$mpdf->SetWatermarkText('[Watermark Text]');

$mpdf->showWatermarkText = true;

}

return $mpdf->output();

花了我一段时间使输出结果正确大小，最后发现关键是您需要为要编写的实例指定宽度和高度。就我而言，输入的PDF文件可能具有不同的大小，因此在编写文件之前，我必须启动另一个实例以获取大小。

如果您的PDF版本高于1.4，PDFI将无法使用。

您必须将其转换为1.4。我在Laravel工作中使用xthiago/pdf-version-converter。