The downloaded file code may be corrupted due to problems.

Source: Internet
Author: User
The downloader code may be faulty, causing the PDF file to damage the PDF file on the server to be healthy: it has been verified by direct downloading through FTP. Part of the download code is as follows: $ file_size & nbsp ;=& nbsp; filesize ($ filedir); header ("Content-type: & the download code may be faulty, resulting in file corruption
The PDF file on the server is healthy: it has been verified by direct FTP download.
Part of the download code is as follows:

$ File_size = filesize ($ filedir );
Header ("Content-type: application/octet-stream; charset = ISO-8859-1 ");
Header ("Cache-control: private ");
Header ("Accept-Ranges: bytes ");
Header ("Accept-Length:". $ this-> FjSize );
Header ("Content-Disposition: attachment; filename =". $ this-> delFileName );
$ Fp = fopen ($ filedir, "r ");
$ Buffer_size = 1024;
$ Cur_pos = 0;
While (! Feof ($ fp) & $ filedir-$ cur_pos> $ buffer_size)
$ Buffer = fread ($ fp, $ buffer_size );
Echo $ buffer;
$ Cur_pos + = $ buffer_size;

If ($ file_size> 0)
$ Buffer = fread ($ fp, $ file_size-$ cur_pos );
$ Buffer = fread ($ fp, $ this-> FjSize );
Echo $ buffer;
Fclose ($ fp );
Flush ();
------ Solution --------------------
$ Fp = fopen ($ filedir, "rb"); // it is opened in binary mode. it is recommended that you do not need it in linux.
For a file opened in text mode, 0x1a is regarded as the end of the file.

While (! Feof ($ fp) & $ filedir-$ cur_pos> $ buffer_size)
While (! Feof ($ fp ))
Feof ($ fp) is the end of the file
$ Filedir-$ cur_pos> $ buffer_size is unnecessary.
Double judgment may lead to errors, for example, when $ filedir is not an integer multiple of $ buffer_size

Besides the file content, you cannot output any other content, including the BOM header.

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