php 文件下载 用fgets解决文件不完整，乱码 完整版

//下载,记录到表
    public function download(){
       // $res=M('document')->where(['id'=>$id])->find();
        $path=$res['address'];
        $filename=$res['name'];
//        $fname = urldecode($fname);
//        $fpath = $_SERVER['DOCUMENT_ROOT'].'/Uploads/Attachement/';
        //避免中文文件名出现检测不到文件名的情况，进行转码utf-8->gbk
        $filename=iconv('utf-8', 'gb2312', $filename)?:$filename;
        $path=iconv('utf-8', 'gb2312', $path)?:$path;
//        $path=$fpath.$filename;
        if(!file_exists($path)){//检测文件是否存在
            header("Content-type:text/html;charset=utf-8");
//            echo "文件不存在！";
            echo "抱歉，文件已经不存在，请联络客服处理！ <a href='javascript:window.history.go(-1)' style='padding:3px 8px;background:#ffb400;color:#fff;border-radius:3px;text-decoration: none;'>返回</a>";

            die();

        }


        $fp=fopen($path,'r');//只读方式打开
        $filesize=filesize($path);//文件大小

//        set_time_limit(0);
//        ini_set('memory_limit', '5M');

        header("Content-type:text/html;charset=utf-8");
        //返回的文件(流形式)
        header("Content-type: application/octet-stream");
//        header("Content-type: application/msword");
        //按照字节大小返回
        header("Accept-Ranges: bytes");
        //返回文件大小
        header("Accept-Length: $filesize");
        //这里客户端的弹出对话框，对应的文件名
        header("Content-Disposition: attachment; filename=".$filename);
        if (preg_match('/MSIE/', $_SERVER['HTTP_USER_AGENT'])) { //for IE
            header('Content-Disposition: attachment; filename="' . rawurlencode($filename) . '"');
        } else {
            header('Content-Disposition: attachment; filename="' . $filename . '"');
        }

        ob_clean();
        flush();
　　　　//fread()下载word，文件不完整，乱码
//        //设置分流
//        $buffer=1024;
//        //来个文件字节计数器
//        $count=0;
//        while(!feof($fp)&&($filesize>$count)){
//            $data=fread($fp,$buffer);
//            $count+=$data;//计数
//            echo $data;//传数据给浏览器端
//
//        }
        while(!feof($fp)) {
            echo fgets($fp, 4096);
        }

        fclose($fp);

        

    }

以下代码未做测试https://www.cnblogs.com/liuzhaobo1999
皮皮蛋 2017/07/10 22:08:08
<?php
  // 暂不支持断点续传
  // $url = 'http://www.mytest.com/debian.iso 

'; 不知道为何获取本地文件大小为0
  $url = 'http://192.168.8.93/download/vm-672/18/0.vmdk';
  $file = basename($url);
  $header = get_headers($url, 1);
  $size = $header['Content-Length'];
 
  $fp = fopen($url, 'rb');
  if ($fp === false) exit('文件不存在或打开失败');
 
  header('Content-Description: File Transfer');
  header('Content-Type: application/octet-stream');
  header('Content-Disposition: attachment; filename="'.$file.'"');
  header('Content-Transfer-Encoding: binary');
  header('Expires: 0');
  header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
  header('Pragma: public');
  header('Content-Length: ' . $size);
 
  ob_clean();
  ob_end_flush();
  set_time_limit(0);
   
  $chunkSize = 1024 * 1024;
  while (!feof($fp)) {
    $buffer = fread($fp, $chunkSize);
    echo $buffer;
    ob_flush();
    flush();
  }
  fclose($fp);
  exit;
2017/7/10 22:19:53
我 2017/7/10 22:19:53
皮皮蛋 2017/07/10 22:19:53
function downloadBagFile($filePath) {
//设置文件最长执行时间和内存
set_time_limit ( 0 );
ini_set ( 'memory_limit', '1024M' );
//检测文件是否存在
if (! is_file ( $filePath )) {
die ( "<b>404 File not found!</b>" );
}
$filename = basename ( $filePath ); //获取文件名字
//开始写输出头信息 
header ( "Cache-Control: public" );
//设置输出浏览器格式
header ( "Content-Type: application/octet-stream" );
header ( "Content-Disposition: attachment; filename=" . $filename );
header ( "Content-Transfer-Encoding: binary" );
header ( "Accept-Ranges: bytes" );
$size = filesize ( $filePath );
$range=0;
//如果有$_SERVER['HTTP_RANGE']参数
if (isset ( $_SERVER ['HTTP_RANGE'] )) {
/*Range头域 　　Range头域可以请求实体的一个或者多个子范围。
例如，
表示头500个字节：bytes=0-499
表示第二个500字节：bytes=500-999
表示最后500个字节：bytes=-500
表示500字节以后的范围：bytes=500-
第一个和最后一个字节：bytes=0-0,-1
同时指定几个范围：bytes=500-600,601-999
但是服务器可以忽略此请求头，如果无条件GET包含Range请求头，响应会以状态码206（PartialContent）返回而不是以200 （OK）.
*/
// 断点后再次连接 $_SERVER['HTTP_RANGE'] 的值 bytes=4390912-
list ( $a, $range ) = explode ( "=", $_SERVER ['HTTP_RANGE'] );
//if yes, download missing part
$size2 = $size - 1; //文件总字节数
$new_length = $size2 - $range; //获取下次下载的长度
header ( "HTTP/1.1 206 Partial Content" );
header ( "Content-Length: {$new_length}" ); //输入总长
header ( "Content-Range: bytes {$range}-{$size2}/{$size}" ); //Content-Range: bytes 4908618-4988927/4988928 95%的时候
} else {
//第一次连接
$size2 = $size - 1;
header ( "Content-Range: bytes 0-{$size2}/{$size}" ); //Content-Range: bytes 0-4988927/4988928
header ( "Content-Length: " . $size ); //输出总长
}
//打开文件
$fp = fopen ( "{$filePath}", "rb" );
//设置指针位置
fseek ( $fp, $range );
//虚幻输出
while ( ! feof ( $fp ) ) {
print ( fread ( $fp, 1024 * 8 ) ); //输出文件
flush (); //输出缓冲
ob_flush ();
}
fclose ( $fp );
exit ();
}
$filePath = "E:/soft/PyCharm_setup.zip";
downloadBagFile ( $filePath );
2017/7/10 22:23:49
我 2017/7/10 22:23:49
皮皮蛋 2017/07/10 22:23:49
<?php  
/** 
 * Created by PhpStorm. 
 * User: Kung 
 * Date: 15-10-21 
 * Time: 下午8:00 
 */  
set_time_limit(0);  //大文件在读取内容未结束时会被超时处理，导致下载文件不全。  
  
$fpath = 'the_file_path';  
$file_pathinfo = pathinfo($fpath);  
$file_name = $file_pathinfo['basename'];  
$file_extension = $file_pathinfo['extension'];  
$handle = fopen($fpath,"rb");  
if (FALSE === $handle)  
    exit("Failed to open the file");  
$filesize = filesize($fpath);  
  
header("Content-type:video/mpeg4");//更具不同的文件类型设置header输出类型  
header("Accept-Ranges:bytes");  
header("Accept-Length:".$filesize);  
header("Content-Disposition: attachment; filename=".$file_name);  
  
$contents = '';  
while (!feof($handle)) {  
    $contents = fread($handle, 8192);  
    echo $contents;  
    @ob_flush();  //把数据从PHP的缓冲中释放出来  
    flush();      //把被释放出来的数据发送到浏览器  
}  
fclose($handle);  
exit;