PHP实现文件安全下载

程序如下：

＄file_name = "info_check.exe";

＄file_dir = "/public/www/download/";

if (!file_exists(＄file_dir . ＄file_name)) { //检查文件是否存在

echo "文件找不到";

exit;

} else {

＄file = fopen(＄file_dir . ＄file_name,"r"); //打开文件

//输入文件标签

Header("Content-type: application/octet-stream");

Header("Accept-Ranges: bytes");

Header("Accept-Length: ".filesize(＄file_dir . ＄file_name));

Header("Content-Disposition: attachment; filename=" . ＄file_name);

//输出文件内容

echo fread(＄file,filesize(＄file_dir . ＄file_name));

fclose(＄file);

exit;}

而如果文件路径是"http"或者"ftp"网址的话，则源代码会有少许改变，程序如下：

＄file_name = "info_check.exe";

＄file_dir = "www.easycn.net/";

＄file = @ fopen(＄file_dir . ＄file_name,"r");

if (!＄file) {

echo "文件找不到";

} else {

Header("Content-type: application/octet-stream");

Header("Content-Disposition: attachment; filename=" . ＄file_name);

while (!feof (＄file)) {

echo fread(＄file,50000);

}

fclose (＄file);

}

这样就可以用PHP直接输出文件了