php文件下载实例代码
- function xiazai($file_dir,$file_name)
- //参数说明：
- //file_dir:文件所在目录
- //file_name:文件名
- {
- $file_dir = chop($file_dir);//去掉路径中多余的空格
- //得出要下载的文件的路径
- if($file_dir != '')
- {
- $file_path = $file_dir;
- if(substr($file_dir,strlen($file_dir)-1,strlen($file_dir)) != '/')
- $file_path .= '/';
- $file_path .= $file_name;
- }
- else
- $file_path = $file_name;
- //判断要下载的文件是否存在
- if(!file_exists($file_path))
- {
- alert('对不起,你要下载的文件不存在');
- return false;
- }
- $file_size = filesize($file_path);
- header("Content-type: application/octet-stream;charset=gbk");
- header("Accept-Ranges: bytes");
- header("Accept-Length: $file_size");
- header("Content-Disposition: attachment; filename=".$file_name);
- $fp = fopen($file_path,"r");
- $buffer_size = 1024;
- $cur_pos = 0;
- while(!feof($fp)&&$file_size-$cur_pos>$buffer_size)
- {//开源代码phpfensi.com
- $buffer = fread($fp,$buffer_size);
- echo $buffer;
- $cur_pos += $buffer_size;
- }
- $buffer = fread($fp,$file_size-$cur_pos);
- echo $buffer;
- fclose($fp);
- return true;
- }