TCPDF ERROR: Unable to create output file

Question

I'm trying to generate pdf with the combination of TCPDF and FPDI. Here is my code.

require_once('../tcpdf/tcpdf.php');
require_once('../FPDI/fpdi.php');

$fileName = '../sample.pdf';

class PDF extends FPDI {
/**
 * "Remembers" the template id of the imported page
 */
var $_tplIdx;
var $numPages = 0;

/**
 * Draw an imported PDF logo on every page
 */
function Header() {

    global $fileName;

    if (is_null($this->_tplIdx)) {
        $this->setSourceFile($fileName);
        $this->_tplIdx = $this->importPage(1);
        $this->numPages = $this->setSourceFile($fileName);
    }
    $size = $this->useTemplate($this->_tplIdx);
}

function Footer() {
    // emtpy method body
}
}

// initiate PDF
$pdf = new PDF($fileName);
$pdf->setFontSubsetting(true);

// add a page
$pdf->AddPage();

// save file
$pdf->Output('output.pdf', 'F');

Here, the last line $pdf->Output('output.pdf', 'F'); is for saving the file. But it is not working. When I was having only $pdf->Output(), it was showing the pdf in browser.

I've tried $pdf->Output('output.pdf', 'D'); for downloading and it worked fine. Seems $pdf->Output('output.pdf', 'F'); is only not working and it shown an error TCPDF ERROR: Unable to create output file: output.pdf.

Note: there is no file permission issues

Can anyone point out the issue please.

Answer 1

Try putting ob_clean(); right above $pdf->Output('output.pdf', 'F');

ob_clean();

// save file
$pdf->Output('output.pdf', 'F');

if that dont work. Than you need to set a path like this:

$pdf->Output('yourpath/output.pdf', 'F');

if you dont know the absolute path try this:

$pdf->Output($_SERVER['DOCUMENT_ROOT'] . 'output.pdf', 'F');