php - My script downloads the source of the page and not the actual file -

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i've got problem downloading script.. made uploading script -> adds files in folder called uploads , inserts id, filename , link database.but can't find way download uploaded file. here's download script:

 <?php      include('config.php');      $dwquery = mysqli_query($db, "select id, filename files");       $id = intval($_get['id']);           while ($row = mysqli_fetch_array($dwquery)) {             echo '<a href="download.php?id='.$row['id'].'">'.$row['filename'].'</a><br />';         }         $download = mysqli_query($db, "select link files id=$id");         $link = mysqli_fetch_array($download);          if($id != '') {         header('content-disposition: attachment; filename='.$link[0]);         readfile($_server['document_root'] . '/project/' .$link[0]);         }      ?>

when select file download downloads source code of page , not actual file.

edit: downloads source code of download.php + text / code inside file want download. gets echo:

echo '<a href="index.php"> index </a> / <a href="upload.php"> upload </a> / <a href="download.php"> download </a> / <a href="logout.php"> logout </a><br />';

and downloaded file is:

<a href="index.php"> index </a> / <a href="upload.php"> upload </a> / <a href="download.php"> download </a> / <a href="logout.php"> logout </a><br /><a href="download.php?id=6">test1.php</a><br /><a href="download.php?id=5">test2.txt</a><br />  , here's actual code of file

your code reads this:

show list of files if download id provided:     show content of file

it should read this:

if download id provided     show content of file else     show list of files

it possible getting path of file wrong have no error checking on existence of file.


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