PHPWord generated docx watermark image with 0 margin is shifted with some space from left and top edge of document - watermark

Question

I generate a docx document with PHPWord and want to make an image to be as a background. Watermark is totally the point for it.
Everything works fine generating document like sections, paragraphs, font styles and sizes, line heights, etc.
But I stucked with this part: my image for background with margins 0 is always shifted with some space from the document's edge.
I go with this code:
$phpWord = new \PhpOffice\PhpWord\PhpWord();
$section = $phpWord->addSection();
$header = $section->addHeader();
$header->addWatermark($path . '/images/test.jpg',
array(
'marginTop' => 0,
'marginLeft'=> 0,
)
);
$section->addText('Is Richard Deckard a replicant?');
$timestamp = date('Hi-ymd');
$filename = 'DOC_' . $timestamp;
$objWriter = \PhpOffice\PhpWord\IOFactory::createWriter($phpWord, 'Word2007');
$objWriter->save($path . '/docs/' . $filename . '.docx');
The result is:
PHPWord watermark image for background
So as you see margins are not 0 but the image is some distance from the left and top edge of the page.

Answer 1

I was able positioning background image to the top-left edge this way
$header = $section->addHeader();
$header->addWatermark('images/test.png',
array(
'width' => 596,
'marginTop' => -36,
'marginLeft' => -50,
'posHorizontal' => 'absolute',
'posVertical' => 'absolute',
));
I think the point is the absolute parameter.
I needed to make negative values on margins, because my body section had inner margins.

Answer 2

I was having the same problem and fortunately I found this question and the answer from #vorvor. Thank you for the answer #vorvor.
I did the same thing in a Laravel 5.6 project and just wanted to share my code with you.
$header = $section->addHeader();
$bg_image = Storage::url('itinerary-assets/Untitled-1_compressed.jpg');
$header->addWatermark($bg_image, [
'marginTop' => -36,
'marginLeft' => -50,
'posHorizontal' => 'absolute',
'posVertical' => 'absolute'
]);