问mPDF SetSourceFile -从临时存储中导入PDF

EN

//part of the code, $content is defined earlier (.pdf file content)
$memoryFile = 'php://memory';
$handle = fopen($memoryFile,'r+');
fwrite($handle,$content);
rewind($handle);

/* dump it to string, just to be sure, part of how i was checking that pdf got saved to $memoryFile
   even with this part removed still doesn't work, so no file issue here
$str=  fread($handle,strlen($content)); //str gets filled with expected data
rewind($handle); //rewind for use by mPDF
*/

$pdf = new mPDF;
$pdf->SetImportUse();
$pagecount = $pdf->SetSourceFile($memoryFile);