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class download
{
var http://pic4.phprm.com/2010/07/22/http://pic4.phprm.com/2010/07/22/$url.jpg.jpg;//远程文件地址
var $file_name = "hdwiki.zip";//下载来的文件名称
var $save_path = "./www.phprm.com";//下载到本地的文件路径
var $localfile;//下载到本地文件的路径和名称
var $warning;//警告信息
var $redown=0;//是否重新下载
/*初始化*/
function seturl($url)
{
if(!empty($url))$this->url = $url;
}
function setfilename($file_name)
{
if(!empty($file_name))$this->file_name = $file_name;
}
function setsavepath($save_path)
{
if(!empty($save_path))$this->save_path = $save_path;
}
function setredown($redown)
{
if(!empty($redown))$this->redown = $redown;
}
function download($url, $redown = 0, $save_path = 0, $file_name = 0)
{
$this->seturl($url);
$this->setfilename($file_name);
$this->setsavepath($save_path);
$this->setredown($redown);
if(!file_exists($this->save_path))
{
$dir = explode("/",$this->save_path);
foreach($dir as $p)
mkdir($p);
}
}
/* 检查url合法性函数 */
function checkurl(){
return preg_match("/^(http|ftp)(://)([a-za-z0-9-_]+[./]+[w-_/]+.*)+$/i", $this->url);
}
//下载文件到本地
function downloadfile()
{
//检测变量
$this->localfile = $this->save_path."/".$this->file_name;
if($this->url == "" || $this->localfile == ""){
$this->warning = "error: 变量设置错误.";
return $this->warning;
}
if (!$this->checkurl()){
$this->warning = "error: url ". $this->url ." 不合法.";
return $this->warning;
}
if (file_exists($this->localfile)){
if($this->redown)
{
unlink($this->localfile);
}
else
{
$this->warning = "warning: 升级文件 ". $this->localfile ." 已经存在！ 重新下载";
return $this->warning;
//exit("error: 本地文件 ". $this->localfile ." 已经存在,请删除或改名后重新运行本程序.");
}
}
//打开远程文件
$fp = fopen($this->url, "rb");
if (!$fp){
$this->warning = "error: 打开远程文件 ". $this->url ." 失败.";
return $this->warning;
}
//打开本地文件
$sp = fopen($this->localfile, "wb");
if (!$sp){
$this->warning = "error: 打开本地文件 ". $this->localfile ." 失败.";
return $this->warning;
}
//下载远程文件
//echo "正在下载远程文件，请等待";
while (!feof($fp)){
$tmpfile .= fread($fp, 1024);
//echo strlen($tmpfile);
}
//保存文件到本地
fwrite($sp, $tmpfile);
fclose($fp);
fclose($sp);
if($this->redown)
$this->warning = "success: 重新下载文件 ". $this->file_name ." 成功";
else
$this->warning = "success: 下载文件 ". $this->file_name ." 成功";
return $this->warning;
}
}
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