/*======================================================
$FileName 为文件名称,必传
$FilePath 为文件路径.选填,可以为相对路径或者绝对路径
路径只能由英文跟数据组成,不能带有中文
======================================================*/
<?php
header("Content-type: text/html;charset=utf-8");
if(strlen($FileName)<=3){echo "下载失败：你所以下载的文件信息有误";return;}
$FileName=iconv("utf-8","gb2312",$FileName);//进行文件名格式转换,以防中文乱码
//开始判断路径
if(!is_null($FilePath)&&strlen($FilePath)>1){
if(substr($FilePath,0,1)=='https://www.jb51.net/'){//判断是否为绝对路径
$FilePath=$_SERVER['DOCUMENT_ROOT'].$FilePath;
}
if(substr($FilePath,-1)!="https://www.jb51.net/"){//检查最后是否为 / 结尾
$FilePath=$FilePath.'https://www.jb51.net/';
}
if(is_numeric(strpos($FilePath,":\"))){//检查是否为绝对路径
$FilePath=str_replace("https://www.jb51.net/","\",$FilePath);
}
}elseif(strlen($FilePath)==1&&$FilePath!="https://www.jb51.net/"){
$FilePath=$FilePath."https://www.jb51.net/";
}else{
$FilePath="";
}
if(!file_exists($FilePath.$FileName)){
echo"下载失败：所要下载的文件未找到";return;
}
/*================================================
发送下载相关的头部信息
=================================================*/
header("Content-type: application/octet-stream");
header("Accept-Ranges: bytes");//按照字节大小返回
header("Accept-Length: $FileSize");//返回文件大小
header("Content-Disposition: attachment; filename=".$FileName);//这里客户端的弹出对话框，对应的文件名
/*================================================
开始下载相关
=================================================*/
$FileSize=filesize($FilePath.$FileName);
$File=fopen($FilePath.$FileName,"r");//打开文件
$FileBuff=512;
while($FileSize>=0){
$FileSize-=$FileBuff;
echo fread($File,$FileBuff);
}
fclose($File);
}
?>