1 /**
 2  * @description  檔案下載 支援本地和遠端檔案
 3  * @param        $fileUrl  檔案本地絕對路徑 OR 遠端地址
 4  * @param string $fileName 下載儲存的檔名
 5  * @param bool   $isLocal  是否是本地檔案
 6  */
 7 function download_file($fileUrl, $fileName = '',$isLocal = true){
 8     if($fileName == ''){
 9         $filename = explode('/', str_replace
 
(DIRECTORY_SEPARATOR, '/', $fileUrl));
10         $filename = end($filename);
11     }else{
12         $filename = $fileName;
13     }
14     if($isLocal){
15         if (!headers_sent()) {
16             if (file_exists($fileUrl) && !empty($filename)) {
17                 $fileOpen = fopen($fileUrl
 
, 'rb');
18                 $fileSize = filesize($fileUrl);
19                 header("Cache-Control: public");//快取控制
20                 header("Content-Type: application/octet-stream");
21                 header("Accept-Ranges: bytes");
22                 header("Content-Length: " . $fileSize);
23                 header
 
('Access-Control-Expose-Headers: Content-Disposition');
24                 header("Content-Disposition: attachment; filename=" . $filename);
25                 $chunk_size = 4096; // 針對大檔案，規定每次讀取檔案的位元組數為4096位元組，直接輸出資料
26                 $sum_buffer = 0; //總的緩衝的位元組數
27                 ob_start(); // 開啟緩衝區
28                 //只要沒到檔案尾，就一直讀取
29                 while (!feof($fileOpen) && $sum_buffer < $fileSize) {
30                     echo fread($fileOpen, $chunk_size);
31                     $sum_buffer += $chunk_size;
32                     ob_flush(); // 重新整理PHP緩衝區到Web伺服器
33                     flush(); // 重新整理Web伺服器緩衝區到瀏覽器
34                 }
35                 ob_end_clean(); // 關閉緩衝區
36                 fclose($fileOpen);
37                 exit;
38             }
39         }
40     }else{
41         $localTemporaryDir = FILE_UPLOAD.'uploads/temporary/';//此處注意改成自己專案配置的檔案下載目錄
42         if(!is_dir($localTemporaryDir)){
43             mkdir($localTemporaryDir,0777,true);
44         }
45         $localFile = $localTemporaryDir . $fileName;
46         $ch = curl_init();
47         curl_setopt($ch, CURLOPT_URL, $url);
48         curl_setopt($ch, CURLOPT_HEADER, FALSE);
49         curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
50         curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 900);
51         curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
52         curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
53         curl_setopt($ch, CURLOPT_BINARYTRANSFER, TRUE);
54         $file = curl_exec($ch);
55         curl_close($ch);
56         if(!strpos($file, '<Error>')){
57             @unlink($localFile);
58             file_put_contents($localFile, $file);
59         }
60         if (file_exists($localFile)) {
61             download_file($localFile);//呼叫自己
62         }
63     }
64 }