圖像下載不起作用。它直接讀取

Question

圖像下載不起作用。它直接讀取而不是下載。

if($_REQUEST['image'] == true){ 

    $URl = $post->guid; 
    echo $URl; 
    header("Content-Type: image/png"); 
    header('Content-Description: File Transfer'); 
    header("Cache-Control: no-cache, validated"); 
    header('Content-Type: application/octet-stream'); 
    header("Content-Disposition: attachment; filename=\"".basename($URl)."\""); 
    header('Content-Transfer-Encoding: binary'); 
    var_dump(readfile($URl)); 
    die; 
} 

Answer 1

嘗試這個報頭格式，

header("Content-type: application/octet-stream"); 
header("Content-Length: " . filesize($filename)); 
header("Content-Disposition: attachment; filename=$filename"); 
header('Content-Transfer-Encoding: binary'); 
header('Cache-Control: must-revalidate, post-check=0, pre-check=0'); 
fpassthru($fp);