<?php

ob_start();  

// $file_name="cookie.jpg";

$file_name="abc.jpg";

//用以解决中文不能显示出来的问题

$file_name=iconv("utf-8","gb2312",$file_name);

//$file_sub_path=$_SERVER['DOCUMENT_ROOT']."marcofly/phpstudy/down/down/";

$file_sub_path=$_SERVER['DOCUMENT_ROOT'];

$file_path=$file_sub_path.$file_name;

//首先要判断给定的文件存在与否

if(!file_exists($file_path)){

echo "没有该文件文件";

return ;

}

$fp=fopen($file_path,"r");

$file_size=filesize($file_path);

//下载文件需要用到的头

ob_end_clean();

Header("Content-type: application/octet-stream");

//Header("Content-type: image/jpeg");

Header("Accept-Ranges: bytes");

Header("Accept-Length:".$file_size);

//Header("Content-Disposition: attachment; filename=".basename($file_name));

 Header("Content-Disposition: attachment; filename=".$file_name);

$buffer=1024;

$file_count=0;

//向浏览器返回数据

while(!feof($fp) && $file_count<$file_size){

$file_con=fread($fp,$buffer);

$file_count+=$buffer;

echo $file_con;

}

@fclose($fp); 

exit(0);  

 /*

第二种方法

*/

/*

ob_start();

$file_name="123.jpg";

$file_name = iconv("utf-8","gb2312",$file_name);

if (!is_file($file_name)){

    echo "url error!";

} else {

    $ua = $_SERVER["HTTP_USER_AGENT"];

    if (preg_match("/MSIE/", $ua)) {

        $encoded_filename = urlencode(basename($file_name));

        $encoded_filename = str_replace("+", "%20", $encoded_filename);

        $con_dis = 'Content-Disposition: attachment; filename="' . $encoded_filename . '"';

    } else if (preg_match("/Firefox/", $ua)) {

        $con_dis = 'Content-Disposition: attachment; filename*="utf8\'\'' . basename($file_name) . '"';

    } else {

        $con_dis = 'Content-Disposition: attachment; filename="' . basename($file_name) . '"';

    }

    $file = fopen($file_name, "r");

    //输入文件标签

    ob_end_clean();Header("Content-type: application/octet-stream");Header("Accept-Ranges: bytes");Header("Accept-Length: ".filesize($file_name));Header($con_dis);

    //输出文件内容

    //读取文件内容并直接输出到浏览器

    echo fread($file, filesize($file_name));@fclose($file);

    exit(0);

}

*/

/*

echo $_SERVER["HTTP_USER_AGENT"];

echo "<br/>";

echo $_SERVER['DOCUMENT_ROOT'];

*/

?>