使用file_get_contents获取存储的内容

Question

Alright so everything is being saved properly but how can I get the url of the file I am saving?

$songs = file_get_contents('https://example.com/tracks/'.$id.'/');
file_put_contents('./tmp/' . stripslashes(htmlspecialchars($songTitle)) . '.mp3', $songs);

Without manually having to get every url, please note I am a new developer still learning.. but is there not something I can just echo into an <a href=""></a> ??

Edit: ' . stripslashes(htmlspecialchars($songTitle)) . ' this is just the name of the file that we're downloading, nothing important about that string.

Answer 1

This depends on your setup, but if your script is in an externally accessible location and you trust $_SERVER client-defined fields, you can use __FILE__ and $_SERVER to accomplish what you want.

The code below assumes:

• Your server is not on HTTPS;
• Files in the subdirectory tmp can be accessed externally;
• You can write to the subdirectory tmp.
• $_SERVER['HTTP_HOST'] and $_SERVER['REQUEST_URI'] can be "trusted".

Try this:

// This is the only thing you need to set to your taste.
$dest_rel_path = 'tmp/' . stripslashes(htmlspecialchars($songTitle)) . '.mp3';

// This is the final file path in your filesystem.
// `dirname(__FILE__)` can be replaced with __DIR__ in PHP >= 5.3.0
// and the str_replace() part makes the code portable to Windows.
$filesystem_path = dirname(__FILE__) . DIRECTORY_SEPARATOR . str_replace('/', DIRECTORY_SEPARATOR, $dest_rel_path);

$songs = file_get_contents('https://example.com/tracks/'.$id.'/');
file_put_contents($filesystem_path, $songs);

// This takes the URL that the user requested and replaces the
// part after the last '/' with our new .mp3 location.
$req_uri = $_SERVER['REQUEST_URI'];
$url_path = substr($req_uri, 0, 1 + strrpos($req_uri, '/')) . $dest_rel_path;
$url = 'http://' . $_SERVER['HTTP_HOST'] . $url_path;
echo "<a href=\"$url\">This is my link to $songTitle!</a>";