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