Warning: Cannot modify header information - headers already sent by

  
    $key = $_GET['key']; 
    $page = "{videos_pages_path.replace('\\', '/')}/".$key."/"; 
    header("Location: ".$page); 
    echo ""; 
    echo "Redirecting... Click on the link."; 
?> 
 

 Warning: Cannot modify header information - headers already sent by (output started at C:\Users\Rodio\OpenServer\domains\pornvideos.local\viev.php:1) in C:\Users\Rodio\OpenServer\domains\pornvideos.local\viev.php on line 5