php下载文件代码

 ???????$file=fopen(‘文件地址‘,"r"); ???????header("Content-Type: application/octet-stream"); ???????header("Accept-Ranges: bytes"); ???????header("Accept-Length: ".filesize(‘文件地址‘)); ???????header("Content-Disposition: attachment; filename=文件名称"); ???????echo fread($file,filesize(‘文件地址‘)); ???????fclose($file);