I am trying to download pdf from html2pdf. Download dialog box doesn't appear and it gives error
Some data has already been output, can't send PDF file
I am trying to fetch the data from database and convert it into pdf downloadable. Here is the code
<?php
$content = '<html><body style=" background-color:#edeff0;
margin:0px;padding:0px;">';
$content .= '<p>kjhj</p>';
$content .= '</body></html>';
require_once('html2pdf/html2pdf.class.php');
$html2pdf = new HTML2PDF('P','A4','fr');
$html2pdf->WriteHTML($content);
$separator = md5(time());
$eol = PHP_EOL;
$filename = "receipt.pdf";
$pdfdoc = $html2pdf->Output($filename, 'D');
header("Content-Disposition: attachment; filename=receipt.pdf");
?>