Introduction to the source code of php downloading remote files

This article brings you an introduction to the source code of PHP downloading remote files. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Recently encountered a problem with downloading files in pdf format. After downloading, I can't read or download.

The general idea is to download the file from a remote location first, then read and download it to the user's local computer. Then delete the file without further ado and directly paste the source code

It is best to use a combination of English numbers when naming remote files. Do not use Chinese names and you will encounter problems you can’t think of.

It also includes compression Please read the source code to download the details

<?php
set_time_limit(0);
//允许下载的url
$allowed_url = [
    &#39;&#39;,
    &#39;&#39;,
    &#39;&#39;]; // 允许的url
//$file_urls = post(&#39;file_urls&#39;);
$file_urls = &#39;&#39;;//远程文件路径

$file_url_arr = explode(&#39;,&#39;, $file_urls);
$file_url_arr = array_unique($file_url_arr); // 过滤相同url

//foreach ($file_url_arr as $key => $val) {
//    $url_arr = parse_url($val);
//    if (!isset($url_arr[&#39;host&#39;]) || !in_array($url_arr[&#39;host&#39;], $allowed_url)) {
//        unset($file_url_arr[$key]);
//    }
//}
if (empty($file_url_arr)) {
    $output = array(
        &#39;status&#39; => 2,
        &#39;code&#39; => 999,
        &#39;error&#39; => &#39;未找到合法url&#39;,
    );
    exit(json_encode($output));
}

$download_dir = ROOT.&#39;download&#39;.DIRECTORY_SEPARATOR;
if(!file_exists($download_dir)) mkdir($download_dir, 0777, true);
$tmp_dir = $download_dir.time().rand(100, 999).DIRECTORY_SEPARATOR; // 文件临时存放目录

$downloader = new fileDownloader();

if($file_url_arr && !empty($file_url_arr)) $downloader->download($tmp_dir, $file_url_arr); // 下载文件

$file_lists = scandir($tmp_dir);
$file_lists = array_diff($file_lists, [&#39;.&#39;, &#39;..&#39;]);
$file_lists = array_values($file_lists); // 重置索引
if(empty($file_lists)){
    $output = array(
        &#39;status&#39; => 2,
        &#39;code&#39; => 999,
        &#39;error&#39; => &#39;无下载文件&#39;,
    );
    exit(json_encode($output));
}

//if (count($file_lists) > 1) { // 如果是多个文件就压缩
//    $file_name = $downloader->compress($tmp_dir, $subject_title);
//} else {
    $file_name = $file_lists[0]; // 如果是单个文件就直接输出
//}

$file_headers = get_headers($file_urls, 1);
header("Cache-Control: public");
header("Content-Description: File Transfer");
//header(&#39;Content-disposition: attachment; filename=&#39;.basename($file_name)); //文件名
header(&#39;Content-Type: &#39;.$file_headers[&#39;Content-Type&#39;]); //zip
header("Content-Transfer-Encoding: binary"); //二进制文件
header(&#39;Content-Length: &#39;. filesize($tmp_dir.$file_name)); //文件大小

$user_agent = $_SERVER["HTTP_USER_AGENT"];
$encoded_name = rawurlencode($file_name);
if (preg_match("/Firefox/", $user_agent)) { //火狐浏览器
    header(&#39;Content-Disposition: attachment; filename*=utf-8\&#39;\&#39;&#39;.$encoded_name);
} else { // IE, 谷歌浏览器
    header(&#39;Content-Disposition: attachment; filename="&#39; . $file_name . &#39;"&#39;);
}
ob_clean();
flush();
@readfile($tmp_dir.$file_name);
$downloader->deleteDir($tmp_dir);

//文件下载类
class fileDownloader{

    // 下载文件
    // $dir 文件存放地址,绝对路径
    // $urls 文件下载地址
    public function download($dir, $urls = array()){
        if (!file_exists($dir)) {
            mkdir($dir, 0777, true);
        }
        if (empty($urls)) {
            return;
        }

        foreach ($urls as $val) {
            $file_name_arr = explode(&#39;/&#39;, $val); // 使用 / 分隔url
            $file_name = array_pop($file_name_arr); // 弹出数组的最后一个元素，作为文件名

            // 如果以linux作为主机，需要将utf文件名转换成GBK文件名
//                if (PHP_OS != &#39;WINNT&#39;) {
//                    $file_name = mb_convert_encoding($file_name, &#39;gbk&#39;, &#39;utf-8&#39;); // 把文件名从utf-8转换为gbk
//                }
//            $file_name = mb_convert_encoding($file_name, &#39;gbk&#39;, &#39;utf-8&#39;); // 把文件名从utf-8转换为gbk

            // 下载文件
            $ch = curl_init();
            curl_setopt($ch,CURLOPT_URL,$val);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 0);
            $data = curl_exec($ch);
            error_log(var_export(curl_getinfo($ch), 1));
            curl_close($ch);
            if ($data) {
                // 保存文件
                file_put_contents($dir.$file_name, $data);
            }
        }
    }

    // 压缩文件
    // $dir 扫描目录
    // $filename 压缩文件名
    public function compress($dir, $filename = false){
        if (!file_exists($dir)) {
            return false;
        }

        $file_lists = scandir($dir); // 扫描文件夹
        $file_lists = array_diff($file_lists, [&#39;.&#39;, &#39;..&#39;]); //去除上级目录和当前目录
        if (empty($file_lists)) {
            return false;
        }

        if (!$filename) {
            $filename = time().rand(111, 999).&#39;.zip&#39;;
        } else {
            $filename .= &#39;.zip&#39;;
        }

        $fullname = $dir.$filename; // 带路径的压缩文件名
        if (!file_exists($fullname)) {
            $zip = new ZipArchive();
            if ($zip->open($fullname, ZipArchive::CREATE)==TRUE) {
                foreach($file_lists as $val){
                    if(file_exists($dir.$val)){
                        $zip->addFile($dir.$val, $val);
                    }
                }
                $zip->close();
            }
        }
        return $filename;
    }

    // 递归删除文件和文件夹
    // $path 要删除的文件路径
    public function deleteDir($path)
    {
        //如果是目录则继续
        if (is_dir($path)) {
            $file_lists = scandir($path);//扫描一个文件夹内的所有文件夹和文件并返回数组
            foreach ($file_lists as $val) {//排除目录中的.和..
                if ($val != "." && $val != "..") {//如果是目录则递归子目录，继续操作
                    if (is_dir($path . $val)) {//子目录中操作删除文件夹和文件
                        self::deleteDir($path . $val . &#39;/&#39;);//目录清空后删除空文件夹
                        @rmdir($path . $val . &#39;/&#39;);
                    } else {//如果是文件直接删除
                        unlink($path . $val);
                    }
                }
            }
            @rmdir($path);
        }
    }
}

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