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php header()函数实现文件下载的例子

WBOY
Release: 2016-05-25 16:46:38
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虽然php 中的header()函数 下载文件不支持断点续传功能但有时我们还真需要此功能,如我们下载txt,图片文件时如果直接是个连接估计是直接打开了而不是下载了,那么我们可如何实现下载呢。

<?php
/**
 * 文件下载
 *
 *
 */
header("Content-type:text/html;charset=utf-8");
download(&#39;web/www.phprm.com .txt&#39;, &#39;txt文件下载&#39;);
function download($file, $down_name) {
    $suffix = substr($file, strrpos($file, &#39;.&#39;)); //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_size) {
        $file_con = fread($fp, $buffer);
        $file_count+= $buffer;
        echo $file_con;
    }
    fclose($fp);
}
?>
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