请教：如何做可提供下载的简单网页

在网上找了一段代码：
<?php
$file_name = "info_check.exe";
$file_dir = "http://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);
}
?>