Home Backend Development PHP Tutorial How to download large files in PHP? (code example)

How to download large files in PHP? (code example)

Jan 21, 2019 pm 02:54 PM
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The content of this article is about how to download large files in PHP? (Code example) has certain reference value. Friends in need can refer to it. I hope it will be helpful to you. [Recommended tutorial: php tutorial]

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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