PHP download jpg file is empty workaround _php Tutorial

PHP tutorial Download jpg file as an empty solution

JPG format file, click Open in Browser to show as Red Fork

The code is as follows:

$filetype = "Image/pjpeg";
Header ("Content-type: {$filetype}");

Header ("expires:0");
Header ("Cache-control:must-revalidate, post-check=0,pre-check=0");
Header ("Pragma:public");

$file _content = file_get_contents ($filepath);
echo $file _content;
Exit

First troubleshoot the initial file if there is a problem

1, Echo $filepath;

2, according to the output file full path, open the file, no problem

The suspicion of excluding the original file

Then troubleshoot if there is a problem in the file read process

1, $filetype = "Application/jpeg";

Header ("content-disposition:attachment; Filename= "{$headername}"; ");

Force a file to download

Download to find the file size is the same as the original file, but open or empty, you can determine the file output when there is a problem

With File_put_contents ("D:aaa.jpg", file_get_contents ($filepath)), save the file to the server, the saved file can be opened

At this point I suspect there was a problem encoding the file output to the client.

After a period of tossing, finally to solve the problem, the code is as follows:

Header ("Content-type: {$filetype}");
Header ("expires:0");
Header ("Cache-control:must-revalidate, post-check=0,pre-check=0");
Header ("Pragma:public");
Add encoding settings here
Header (' content-transfer-encoding:binary ');
The most important thing here is to empty the bytes of the output.
Ob_clean ();
This is equal to the two lines injected below, saving code
ReadFile ($filepath);

$file _content = file_get_contents ($filepath);
echo $file _content;
Exit

An explanation of Ob_clean () is attached here:

Clean (erase) the output buffer

I understand that ob_clean () is equal to Response.Clear () in. NET;

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