How to Force File Download in PHP?

Force File Download in PHP

To provide a download link for a file in PHP, you can use the following steps:

1. Retrieve the File Information:

   <code class="php">$filePath = '/path/to/file/on/disk.jpg';
   
   if(file_exists($filePath)) {
       $fileName = basename($filePath);
       $fileSize = filesize($filePath);
   } else {
       die('The provided file path is not valid.');
   }</code>

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2. Output Headers:

   <code class="php">header("Cache-Control: private");
   header("Content-Type: application/stream");
   header("Content-Length: ".$fileSize);
   header("Content-Disposition: attachment; filename=".$fileName);</code>

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3. Output the File:

   <code class="php">readfile ($filePath);                   
   exit();</code>

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Note: Be cautious if implementing this in a function to allow downloads of arbitrary files, as you need to prevent directory traversal and restrict downloads to a defined area.

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