How do I know how many times my file has really downloaded? - php

Question

The task is to create a controller to count the number of file downloads. It also must be able to account for failed or cancelled downloads. I was wondering if anyone knew the best way to go about accomplishing this.
$file = $_GET['download'];
if (ob_get_level()) {
ob_end_clean();
}
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename=' . basename($file));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
return filesize($file);`
$size = filesize($file);
Then if the number of bytes given is approximately equal to the file size:
if ( $size < given bytes) {
$handle = fopen("counter.txt", "r");
while (!feof($handle)) {
$buffer = fgets($handle, 4096);
$buffer=$buffer+1;
}
fclose($handle);
$fp = fopen("counter.txt", "w");
$test = fwrite( $fp, $buffer);
fclose($fp);
}
How to know the number of bytes sent by server to the user after clicking on link?

Answer 1

I'll start with what should be comments:
You've tagged this as javascript, but your quesiotn appears to have nothing to do with javascript. Please don't do that.
I assume you are aware of the gaping security hole exposed by your script / that you are not concerned about it.
Your handling of output buffering is wrong.
return filesize($file);
What is this line of code supposed to do?
header('Expires: 0');
no.
header('Pragma: public');
again, no.
As to your question - its all covered in the manual:
<?php
ignore_user_abort(1);
$file = $_GET['download'];
if (!is_readable($file)) {
die "No such file";
}
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename=' . basename($file));
header('Content-Transfer-Encoding: binary');
header('Cache-Control: max-age=0; must-revalidate');
header('Content-Length: ' . filesize($file));
$count=0;
$ih=fopen($file, 'r');
while (CONNECTION_NORMAL==connection_status() && !feof($ih)) {
print fgets($ih, 4096);
}
log_completion(feof($ih));
BTW: This does not give an accurate record if the file was downloaded - you can only tell if the content has left PHP land.