function getFileSize($url){ //獲取文件大小函數
$url = parse_url($url);
if($fp = @fsockopen($url['host'],empty($url['port'])?80:$url['port'],$error)){
fputs($fp,"GET ".(empty($url['path'])?'/':$url['path'])." HTTP/1.1\r\n");
fputs($fp,"Host:$url[host]\r\n\r\n");
while(!feof($fp)){
$tmp = fgets($fp);
if(trim($tmp) == ''){
break;
}else if(preg_match('/Content-Length:(.*)/si',$tmp,$arr)){
return trim($arr[1]);
}
}
return null;
}else{
return null;
}
};
$filename = $_REQUEST["url"]; //獲取文件URL(這裏的url已經是完整的,若不完整需要修改)
$filesize = getFileSize($filename);
$realfilename = substr(strrchr($filename,"/"),1); //獲取文件名(以url最後一個斜槓之後的內容作爲文件名)
header ("Content-Type: application/octet-stream"); //申明下載
header ('Content-Disposition: attachment;filename="'.$realfilename.'"'); //下載文件名
header("Accept-Ranges: bytes");
header("Content-Length: ".$filesize);
readfile ($filename);
這裏的代碼需要放到一個新的php文件中,文件地址可通過表單形式提交到這個php文件