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<?php
class PHP_DW {
private $base_dw = 'downloads';
private $base_count = '.download_count';
private function __get_full_path($path) {
if (basename($path) !== $path) {
return null;
}
return $this->base_dw . '/' . $path;
}
private function __incr_count($filename) {
/* open the file */
$fh = fopen($this->base_count . '/' . $filename . '.cnt', "r+");
if (is_resource($fh) and flock($fh, LOCK_EX)) {
$count = fgets($fh);
if ($count === false)
$count = 0;
ftruncate($fh, 1);
rewind($fh);
fwrite($fh, $count + 1);
flock($fh, LOCK_UN);
fclose($fh);
}
}
public function download($filename) {
$path = $this->__get_full_path($filename) or die('invalid file');
if (@readfile($path) !== false) {
header('Content-Description: File Transfer');
header('Content-Disposition: attachment; filename=' . $filename);
header('Content-Length: '. filesize($path));
header('Cache-Control: must-revalidate');
$this->__incr_count($filename);
}
}
public function get_count($path) {
if (!$this->__is_valid_path($path)) return 0;
$fh = @fopen($this->base . $path, "r");
if (!is_resource($fh))
return 0;
$count = fgets($fh) or '0';
fclose($fh);
return $count;
}
}
$var = new PHP_DW();
$var->download($_GET['file']);
?>
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