mPDF: how to remove setHeader() & setFooter() borders - php

Question

i have a mPDF report on my system and in the report, it has a header and footer where i use $mpdf->setHeader(); & $mpdf->setFooter(); to set the header and footer. but it displays a bottom border for header and top border for footer. can anyone help me how to remove this?
heres the image:
Here's my Code:
$mpdf=new mPDF('','LETTER-L','','',35,35,60,25,10,10);
//left margin, right margin, body, top margin,top margin,bottom margin,
/*HEADER Monthly Accomplishment Report*/
$mpdf->SetHeader('Sample');
/*FOOTER xMonthly Accomplishment Report*/
$mpdf->SetFooter('Sample');
//==============================================================
//=====================FILE DESCRIPTION=========================
//==============================================================
$mpdf->SetTitle('Monthly Accomplishment Report');
$mpdf->SetSubject('Report');
$mpdf->SetAuthor('sample');
$mpdf->Output('sample.pdf','I');
exit;
//==============================================================
//==============================================================
//==============================================================

Answer 1

You could use those two mpdf properties instead:
$mpdf->defaultheaderline = 0;
$mpdf->defaultfooterline = 0;

Answer 2

I had a look at the documentation of the method setHeader and found that exists a line parameter :
$line: specify whether to draw a line under the Header
You passed a string to the method but it also accept an array of options.
$line mentionned in the doc is not exactly a parameter of the method, rather a key of the configuration array.
So this code should accomplish what you look for, based on the documentation:
$mpdf = new mPDF('','LETTER-L','','',35,35,60,25,10,10);
$headerFooterContent = 'Sample';
$oddEvenConfiguration =
[
'L' => [ // L for Left part of the header
'content' => '',
],
'C' => [ // C for Center part of the header
'content' => '',
],
'R' => [
'content' => $headerFooterContent,
],
'line' => 0, // That's the relevant parameter
];
$headerFooterConfiguration = [
'odd' => $oddEvenConfiguration,
'even' => $oddEvenConfiguration
];
$mpdf->SetHeader($headerFooterConfiguration);
$mpdf->SetFooter($headerFooterConfiguration);
The setHeader and setFooter methods accept the same arguments (they are almost copy/pasted in the library).
I let you look further at the specific part of the examples related to complex header configuration of mPDF.
Let me know if it solves your issue.

Answer 3

Depending on the version of mpdf, you can use this:
$pdf->options['defaultheaderline'] = 0;
$pdf->options['defaultfooterline'] = 0;