file exist in php download - php

Question

I'm download file but i want. IF file exist from drive C i can download,
ELSE IF file exist automatic can donwload file from drive D . Else "File Not Found"
i'm confused :(
This is my quoute script
$id = $_GET['id'];
$query = "SELECT * FROM upload WHERE id = '$id'";
$jl = mysql_query($query);
$data = mysql_fetch_array($jl);
header("Content-Disposition: attachment; filename=".$data['name']);
header("Content-length: ".$data['size']);
header("Content-type: ".$data['type']);
$filename = $data['name'];
if (file_exists($filename)) {
$fp = fopen("d:/result/".$data['name'], 'r');
$content = fread($fp, filesize('d:/result/'.$data['name']));
fclose($fp);
}
else if (file_exists($filename)) {
$fp = fopen("c:/result/".$data['name'], 'r');
$content = fread($fp, filesize('c:/result/'.$data['name']));
fclose($fp);
}
else {
echo "File Not Found";
}
// show file download
echo $content;
exit;

Answer 1

You could specify the list of paths in an array.
$paths ['c:/result/', 'd:/result/];
then you loop through these paths:
foreach($paths as $path){
if(file_exists($path.$data['name'])){
print file_get_contents($path.$data['name']);
}
}
Full solution for you:
//prevent sql injection
$data = mysql_fetch_array(mysql_query("SELECT * FROM upload WHERE id = '".intval($_GET['id'])."'"));
//now you can add as much paths as you like
$paths = [
'd:/result/',
'c:/result/'
];
foreach ($paths as $path) {
if (file_exists($path . $data['name'])) {
header("Content-Disposition: attachment; filename=" . $data['name']."; ".
"Content-length: " . $data['size']."; ".
"Content-type: " . $data['type']);
print file_get_contents($path . $data['name']);
exit;
}
}
echo "File not found";
exit;

Answer 2

Your code is backwards. You've output your content headers already, so if the file doesn't exist, your user will be downloading a file whose contents are "File Not Found". That'd just confuse them when they double-click on their pdf/word/whatever file and get a "file is corrupted" error.
Your code should be more like:
$c_source = 'C:/...';
$d_source = 'D:/...';
if (is_readable($c_source)) {
header(...); // <--do this only if you found a file
readfile($c_source);
} else if (is_readable($d_source)) {
header(...); // do this only if you found a file
readfile($d_source);
} else {
die("File not found");
}