PHP 弹出文件下载原理代码

2024-09-01 07:43:05

/**
* @author default7<default7@zbphp.com>
* @description 演示PHP弹出下载的原理
*
* @param $file_name
*/
function downFile($file_name)
{
$file_path = "/tmp/" . $file_name;
$buffer = 102400; //一次返回102400个字节
if (!file_exists($file_path)) {
echo "<script type='text/javascript'> alert('对不起！该文件不存在或已被删除！'); </script>";
return;
}
$fp = fopen($file_path, "r");
$file_size = filesize($file_path);
$file_data = '';
while (!feof($fp)) {
$file_data .= fread($fp, $buffer);
}
fclose($fp);
//Begin writing headers
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: public");
header("Content-Description: File Transfer");
header("Content-type:application/octet-stream;");
header("Accept-Ranges:bytes");
header("Accept-Length:{$file_size}");
header("Content-Disposition:attachment; filename={$file_name}");
header("Content-Transfer-Encoding: binary");
echo $file_data;
}

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