OSDev.org

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<a href="game.zip">Download the game.</a><br>

<?php

# Opening the file for reading

$filename = "counter.txt";
$openfile = fopen ($filename, "r");
$readfile = fread ($openfile, filesize ($filename));

# Checking whether the file has never been downloaded, downloaded only once or more times, and printing out the corresponding message

switch ($readfile) {
  case (NULL or 0) : echo "This game has never been downloaded.";
                     break;
  case (1)         : echo "This game has been downloaded only once.";
                     break;
  default          : echo "This game has been downloaded $readfile times.";
                     break;
}

# Closing the file

fclose ($openfile);

# Opening the file for writing

if (@fopen ($filename, "w")) {
  $openfile = fopen ($filename, "w");
}
else {
  echo "Error: failed to open the file for writing.";
}

# Writing the new value of the counter into the file

fwrite ($openfile, $readfile+1);

# Closing the file

fclose ($openfile);

?>

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<meta HTTP-EQUIV="refresh" content="1; URL=http://www.game.com/game.zip">

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header ("Location: http://www.game.com/game.zip");