将文件转换成PDF

我有一个陌生人文件，但我不知道它是哪个扩展名，因此我需要将其转换为 PDF ，因此我们的想法是内容，然后我们将其另存为 PDF

I have a stranger document that I don't know which extension it is, and I need to convert it into a PDF, so the idea is to get that content dynamically, then we save it in server as a PDF

我的尝试:

$responce = $this->getDocumentContent();//this function returns me the $responce content bellow. 
$documentFolder = $this->getDirectory().'/document/'; //var/www/project/document/
$documentFullPath = $this->getDirectory().'/document/file1.pdf';
$this->_io->mkdir($documentFolder, 0775);//create folder var/www/project/document
$document = fopen($documentFullPath, "w+");//create pdf file var/www/project/document/file1.pdf
fwrite($document, $responce);
fclose($document);

现在有了这段代码，我在var/www/project/document/file1.pdf中很好地创建了file1.pdf，但是它是空的！，没有内容，file1.pdf的权重不是0而是163.2 Ko，但是我什么都看不到.我不知道问题出在哪里.

Now with this code, I create well the file1.pdf in var/www/project/document/file1.pdf but it is empty !, there is no content, the file1.pdf weight is not 0 but 163.2 Ko but I see anything. I don't know where is the issue.

$responce =

string(163146) "%PDF-1.4
%????
1 0 obj
<< 
/Type /Catalog 
/Pages 2 0 R 
/Metadata 63 0 R 
>> 
endobj
2 0 obj
<< 
/Type /Pages 
/Kids [ 01 0 R 8 0 R ] 
/Count 2 
/MediaBox [ 0 0 618 003 ] 
>> 
endobj
3 0 obj
<< 
/ModDate (D:20190907120701+02'00')
/CreationDate (D:20130904150701+02'00')
/Title (F:/Data/Composer/0510.IN.PDF)
/Subject (NONE)
/Author (User: Windows XP/ User)
/Creator (PDF/PReS Version: 6.1.1       )
/Producer ([ClibPDF Library 2.02-r1-2] Windows XP)
>> 
endobj
5 0 obj
<< 
/Type /Page 
/Parent 2 0 R 
/Resources << /Font << /Fcpdf0 30 0 R >> /XObject << /6p 8 0 R >> /ProcSet 7 0 R >> 
/MediaBox [ 0 0 595 842 ] 
/CropBox [ 0 0 595 842 ] 
/Rotate 0 
/Contents 6 0 R 
>> 
endobj
6 0 obj
<< /Length 246 /Filter [ /FlateDecode ] >> 
stream
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