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How to use php to download large files

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Release: 2023-04-04 19:42:01
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The content of this article is about how to use php to download large files. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

The key to downloading large files is to read the byte stream in a loop

function downloadFile($filename) {

    //获取文件的扩展名
    $allowDownExt = array ( 'rar', 'zip', 'png', 'txt', 'mp4', 'html');

    //获取文件信息
    $fileExt = pathinfo($filename);

    //检测文件类型是否允许下载
    if(!in_array($fileExt['extension'], $allowDownExt)) {
        return false;
    }

    //设置脚本的最大执行时间,设置为0则无时间限制
    set_time_limit(0);
    ini_set('max_execution_time', '0');

    //通过header()发送头信息
    //因为不知道文件是什么类型的,告诉浏览器输出的是字节流
    header('content-type:application/octet-stream');

    //告诉浏览器返回的文件大小类型是字节
    header('Accept-Ranges:bytes');

    //获得文件大小
    //$filesize = filesize($filename);//(此方法无法获取到远程文件大小)
    $header_array = get_headers($filename, true);
    $filesize = $header_array['Content-Length'];

    //告诉浏览器返回的文件大小
    header('Accept-Length:'.$filesize);
    //告诉浏览器文件作为附件处理并且设定最终下载完成的文件名称
    header('content-disposition:attachment;filename='.basename($filename));

    //针对大文件,规定每次读取文件的字节数为4096字节,直接输出数据
    $read_buffer = 4096;
    $handle = fopen($filename, 'rb');
    //总的缓冲的字节数
    $sum_buffer = 0;
    //只要没到文件尾,就一直读取
    while(!feof($handle) && $sum_buffer<$filesize) {
        echo fread($handle,$read_buffer);
        $sum_buffer += $read_buffer;
    }

    //关闭句柄
    fclose($handle);
    exit;

}
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