What should I do if php cannot output the file?

Solution to the problem that php cannot output files: 1. Add "ob_clean();"; 2. Set "$pdf->Output('yourpath/output.pdf', 'F');"; 3. Set "Output($_SERVER['DOCUMENT_ROOT']".

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

What should I do if php cannot output the file?

Specific question:

php – TCPDF Error: Unable to create the output file

I am trying to generate pdf using a 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 '); for saving the file. But it didn't work. When I only have $pdf-> Output(), it shows the pdf in the browser.

I tried $pdf->Output( 'output.pdf','D'); downloaded and it worked fine. It seems $pdf->output('output.pdf','F'); just didn't work, it showed the error TCPDF Error: Unable to create output file :output.pdf.

NOTE: There is no file permission issue

Can anyone point this out.

Solution:

Try putting ob_clean(); exactly at $pdf->output('output.pdf','F');

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

If that doesn't work. Than you need to set the path like this:

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

If you don’t know the absolute path, try this:

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

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