php带密码功能并下载远程文件保存本地指定目录修改加强版_php技巧

 
 
 
 
 
 
 
 
 
PHP代码: 
 代码如下:

# Copyright 2010 快乐飞扬 
# http://www.klfy.org/ 供新手学习参考 
set_time_limit (0); //不限时 24 * 60 * 60 
$password = 'admin'; //管理密码 
$pass = $_POST['password']; 
if ($pass == $password) { 
class runtime { 
var $StartTime = 0; 
var $StopTime = 0; 
function get_microtime(){list($usec, $sec) = explode(' ', microtime()); 
return ((float)$usec + (float)$sec);} 
function start() {$this->StartTime = $this->get_microtime();} 
function stop() {$this->StopTime = $this->get_microtime();} 
function spent() { return round(($this->StopTime - $this->StartTime) * 1000, 1);} 
} 
$runtime= new runtime; 
$runtime->start(); 
if (!isset($_POST['submit'])) die(); 
$destination_folder = './Download/'; // 下载的文件保存目录。必须以斜杠结尾 
if(!is_dir($destination_folder)) //判断目录是否存在 
mkdir($destination_folder,0777); //若无则创建，并给与777权限 windows忽略 
$url = $_POST['url']; 
$headers = get_headers($url, 1); //得到文件大小 
if ((!array_key_exists("Content-Length", $headers))) {$filesize=0; } 
$newfname = $destination_folder . basename($url); 
$file = fopen ($url, "rb"); 
if ($file) { 
$newf = fopen ($newfname, "wb"); 
if ($newf) 
while(!feof($file)) {fwrite($newf, fread($file, 1024 * 8 ), 1024 * 8 );} 
} 
if ($file) {fclose($file);} 
if ($newf) {fclose($newf);} 
$runtime->stop(); 
echo '
下载耗时: '.$runtime->spent().' 微秒,文件大小 '.$headers["Content-Length"].' 字节
'; 
echo '
下载成功！ '.$showtime=date("Y-m-d H:i:s").'
'; 
}elseif(isset($_POST['password'])){ 
echo '
密码错误！请从新输入密码!
'; 
} 
?>