PHP下载封装

function download($has_name, $has_size, $file_name)
{
ob_end_clean();
//用以解决中文不能显示出来的问题
$file_name = iconv("utf-8", "gb2312", $file_name);
$file_sub_path = $_SERVER['DOCUMENT_ROOT'] . "/Download/";
$file_path = $file_sub_path . $file_name;
//首先要判断给定的文件存在与否
if (!file_exists($file_path)) {
echo "没有该文件文件:" . $file_path;
return;
}
$fp = fopen($file_path, "rb");
$file_size = filesize($file_path);
//下载文件需要用到的头
Header("Content-type: application/octet-stream");
Header("Accept-Ranges: bytes");
if ($has_size) {
Header('Content-Length: ' . $file_size);
Header("Accept-Length:" . $file_size);
}
if ($has_name) {
Header("Content-Disposition: attachment; filename=" . $file_name);
}
$buffer = 1024;
$file_count = 0;
//向浏览器返回数据
while (!feof($fp) && $file_count < $file_size) {
$file_con = fread($fp, $buffer);
$file_count += $buffer;
echo $file_con;
}
}

ob_end_clean();