Dompdf Create Watermark and Page Numbers
02-11-2019
$options = new Options();
$options->set('isPhpEnabled', 'true');
$dompdf = new Dompdf($options);
$dompdf->setOptions($options);
$dompdf->loadHtml('<html>....');
$dompdf->setPaper('A4', '');
$dompdf->render();
// Instantiate canvas instance
$canvas = $dompdf->getCanvas();
$w = $canvas->get_width();
$h = $canvas->get_height();
$pageNumberWidth = $w / 2;
$pageNumberHeight = $h - 50;
$GLOBALS["logo1"]=public_path('images/logo/icon.png');
$GLOBALS["logo2"]=public_path('images/logo/kultur_logo.png');
$canvas->page_script('
if ($PAGE_NUM > 1) {
$current_page = $PAGE_NUM-1;
$total_pages = $PAGE_COUNT-1;
$font = $fontMetrics->getFont("times", "normal");
$pdf->set_opacity(1,"Multiply");
$pdf->text(297.64, 791.89, "$current_page / $total_pages", $font, 10, array(0,0,0));
$pdf->set_opacity(0.2,"Multiply");
$pdf->image($GLOBALS["logo1"], 475.28, 771.89, 50, 50);
$pdf->image($GLOBALS["logo2"], 75.28, 771.89, 50, 50);
}
');
$canvas->set_opacity(.1,'Multiply');//Multiply means apply to all pages.
// Specify watermark text
$text = "http://www.codesenior.com";
// Instantiate font metrics class
$fontMetrics = new FontMetrics($canvas, $options);
$font = $fontMetrics->getFont('times');
$txtHeight = $fontMetrics->getFontHeight($font, 150);
$textWidth = $fontMetrics->getTextWidth($text, $font, 40);
$x = (($w-$textWidth)/2);
$y = (($h-$txtHeight)/2);
//page_text method applies text to all pages.
$canvas->page_text($x, $y, $text, $font, 40,$color = array(255,0,0),
$word_space = 0.0, $char_space = 0.0, $angle = 20.0);
return $dompdf->stream($project->code . '.pdf', array("Attachment" => 0));
At Line 2: This option must be set because we will use it in the page_script() method at line 17.
At Line 7: To add watermark and page number, we should render HTML content before.
At Line 15, 16: $GLOBALS keyword is used for passing variables to page_script() method.
At Line 22:To prevent the page number opacity from changing , override opacity value defined at line 25.
At Line 25: This opacity value is used for images which are defined at line 26 and 27.
Some Notes:
- page_text() method applies to all pages, but notice that page is starting from zero.
- If you want to ignore first page, you should use æ,$canvas->page_script() method.
- As seen above example, $PAGE_NUM variable is accessible from page_script() method.
Multiply in this example, which means apply to all pages. This second parameter is optional. If not specified, default value is Normal
