php download file method

This article mainly introduces the method of downloading files in PHP, which has certain reference value. Now I share it with you. Friends in need can refer to it.

<?php
/**
 * @param $filePath //下载文件的路径
 * @param int $readBuffer //分段下载 每次下载的字节数 默认1024bytes
 * @param array $allowExt //允许下载的文件类型
 * @return void
 */
function downloadFile($filePath, $readBuffer = 1024, $allowExt = [&#39;jpeg&#39;, &#39;jpg&#39;, &#39;peg&#39;, &#39;gif&#39;, &#39;zip&#39;, &#39;rar&#39;, &#39;txt&#39;])
{
    //检测下载文件是否存在 并且可读
    if (!is_file($filePath) && !is_readable($filePath)) {
        return false;
    }
    //检测文件类型是否允许下载
    $ext = strtolower(pathinfo($filePath, PATHINFO_EXTENSION));
    if (!in_array($ext, $allowExt)) {
        return false;
    }
    //设置头信息
    //声明浏览器输出的是字节流
    header(&#39;Content-Type: application/octet-stream&#39;);
    //声明浏览器返回大小是按字节进行计算
    header(&#39;Accept-Ranges:bytes&#39;);
    //告诉浏览器文件的总大小
    $fileSize = filesize($filePath);//坑 filesize 如果超过2G 低版本php会返回负数
    header(&#39;Content-Length:&#39; . $fileSize); //注意是&#39;Content-Length:&#39; 非Accept-Length
    //声明下载文件的名称
    header(&#39;Content-Disposition:attachment;filename=&#39; . basename($filePath));//声明作为附件处理和下载后文件的名称
    //获取文件内容
    $handle = fopen($filePath, &#39;rb&#39;);//二进制文件用‘rb’模式读取
    while (!feof($handle) ) { //循环到文件末尾 规定每次读取（向浏览器输出为$readBuffer设置的字节数）
        echo fread($handle, $readBuffer);
    }
    fclose($handle);//关闭文件句柄
    exit;
}

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