一个简单的php文件下载源代码,虽不支持断点续传等,但是可以满足一些常用的需求了。php下载文件其实用一个a标签就能实现,比如 magento-1.8.1.0.zip 。但是遇到一些浏览器能识别的格式,比如.txt,.html,.pdf等,再用abc.txt 想必也知道会发生什么了。
复制代码 代码如下:
/**
* 文件下载
*
**/
header("Content-type:text/html;charset=utf-8");
download('web/magento-1.8.1.0.zip', 'magento下载');
function download($file, $down_name){
$suffix = substr($file,strrpos($file,'.')); //获取文件后缀
$down_name = $down_name.$suffix; //新文件名,就是下载后的名字
//判断给定的文件存在与否
if(!file_exists($file)){
die("您要下载的文件已不存在,可能是被删除");
}
$fp = fopen($file,"r");
$file_size = filesize($file);
//下载文件需要用到的头
header("Content-type: application/octet-stream");
header("Accept-Ranges: bytes");
header("Accept-Length:".$file_size);
header("Content-Disposition: attachment; filename=".$down_name);
$buffer = 1024;
$file_count = 0;
//向浏览器返回数据
while(!feof($fp) && $file_count $file_con = fread($fp,$buffer);
$file_count += $buffer;
echo $file_con;
}
fclose($fp);
}
?>
也可以看看这个注释比较详细的代码:
复制代码 代码如下:
//文件下载,下载一张图片
//$file_name="Angel.mp3";
$file_name="bjnihao.jpg"; //出现中文 程序无法完成下载 提示:文件不存在
//对文件进行转码(PHP文件函数 比较古老 需对中文码转成 gb2312)
//iconv — Convert string to requested character encoding
//by www.jb51.net
$file_name=iconv("utf-8","gb2312",$file_name);
//设置文件下载路径(相对路径)
//$file_path="./dowm/".$file_name;
//使用绝对路径
$file_path=$_SERVER['DOCUMENT_ROOT']."/http/dowm/".$file_name;
//打开文件---先判断再操作
if(!file_exists($file_path)){
echo "文件不存在";
return ; //直接退出
}
//存在--打开文件
$fp=fopen($file_path,"r");
//获取文件大小
$file_size=filesize($file_path);
//http 下载需要的响应头
header("Content-type: application/octet-stream"); //返回的文件
header("Accept-Ranges: bytes"); //按照字节大小返回
header("Accept-Length: $file_size"); //返回文件大小
header("Content-Disposition: attachment; filename=".$file_name);//这里客户端的弹出对话框,对应的文件名
//向客户端返回数据
//设置大小输出
$buffer=1024;
//为了下载安全,我们最好做一个文件字节读取计数器
$file_count=0;
//判断文件指针是否到了文件结束的位置(读取文件是否结束)
while(!feof($fp) && ($file_size-$file_count)>0){
$file_data=fread($fp,$buffer);
//统计读取多少个字节数
$file_count+=$buffer;
//把部分数据返回给浏览器
echo $file_data;
}
//关闭文件
fclose($fp);
?>
封装函数:
/*
封装函数:
参数说明----$file_name:文件名
$file_sub_dir:文件下载的子路径
*/
function file_dowm($file_name,$file_sub_dir){
//文件转码
$file_name=iconv("utf-8","gb2312",$file_name);
//使用绝对路径
$file_path=$_SERVER['DOCUMENT_ROOT']."$file_sub_dir".$file_name;
//打开文件---先判断再操作
if(!file_exists($file_path)){
echo "文件不存在";
return ; //直接退出
}
//存在--打开文件
$fp=fopen($file_path,"r");
//获取文件大小
$file_size=filesize($file_path);
/*
//这里可以设置超过多大不能下载
if($file_size>50){
echo "文件太大不能下载";
return ;
}*/
//http 下载需要的响应头
header("Content-type: application/octet-stream"); //返回的文件
header("Accept-Ranges: bytes"); //按照字节大小返回
header("Accept-Length: $file_size"); //返回文件大小
header("Content-Disposition: attachment; filename=".$file_name);//这里客户端的弹出对话框,对应的文件名
//向客户端返回数据
//设置大小输出
$buffer=1024;
//为了下载安全,我们最好做一个文件字节读取计数器
$file_count=0;
//判断文件指针是否到了文件结束的位置(读取文件是否结束)
while(!feof($fp) && ($file_size-$file_count)>0){
$file_data=fread($fp,$buffer);
//统计读取多少个字节数
$file_count+=$buffer;
//把部分数据返回给浏览器
echo $file_data;
}
//关闭文件
fclose($fp);
}
file_dowm("bjnihao.jpg","/http/dowm/");
?>
另一个代码:
复制代码 代码如下:
public function downloads($name){
$name_tmp = explode("_",$name);
$type = $name_tmp[0];
$file_time = explode(".",$name_tmp[3]);
$file_time = $file_time[0];
$file_date = date("Y/md",$file_time);
$file_dir = SITE_PATH."/data/uploads/$type/$file_date/";
if (!file_exists($file_dir.$name)){
header("Content-type: text/html; charset=utf-8");
echo "File not found!";
exit;
} else {
$file = fopen($file_dir.$name,"r");
Header("Content-type: application/octet-stream");
Header("Accept-Ranges: bytes");
Header("Accept-Length: ".filesize($file_dir . $name));
Header("Content-Disposition: attachment; filename=".$name);
echo fread($file, filesize($file_dir.$name));
fclose($file);
}
}

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