关于批量下载ftp服务器的文件的方法

前言：批量下载网上有一堆，但是无奈都基本是对自己项目作用不大，研究了一下，分享和记录

1.首先要知道这个是从html页面发起的所以必须要加入这段话才行

//之前尝试用ajax和layer弹层来实现发现都会产生错误因此必须要用这个方法才行，前端的方法

location.href = 你想要访问的.php网页;

//后端的实现方法

<?php//这个class类是借鉴网友的，具体内部逻辑我也不太清晰，所以。。。。。。。class zipfile {    var $datasec = array ();    var $ctrl_dir = array ();    var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";    var $old_offset = 0;

    function unix2_dostime($unixtime = 0){        $timearray = ($unixtime == 0) ? getdate () : getdate($unixtime);        if ($timearray [‘year‘] < 1980){            $timearray [‘year‘] = 1980;            $timearray [‘mon‘] = 1;            $timearray [‘mday‘] = 1;            $timearray [‘hours‘] = 0;            $timearray [‘minutes‘] = 0;            $timearray [‘seconds‘] = 0;        }        return (($timearray [‘year‘] - 1980) << 25) | ($timearray [‘mon‘] << 21) | ($timearray [‘mday‘] << 16) | ($timearray [‘hours‘] << 11) | ($timearray [‘minutes‘] << 5) | ($timearray [‘seconds‘] >> 1);    }    function add_file($data, $name, $time = 0){        $name = str_replace(‘\\‘, ‘/‘, $name);

        $dtime = dechex($this->unix2_dostime($time));        $hexdtime = ‘\x‘ . $dtime [6] . $dtime [7] . ‘\x‘ . $dtime [4] . $dtime [5] . ‘\x‘ . $dtime [2] . $dtime [3] . ‘\x‘ . $dtime [0] . $dtime [1];        eval(‘$hexdtime = "‘ . $hexdtime . ‘";‘);

        $fr = "\x50\x4b\x03\x04";        $fr .= "\x14\x00";        $fr .= "\x00\x00";        $fr .= "\x08\x00";        $fr .= $hexdtime;

        $unc_len = strlen($data);        $crc = crc32($data);        $zdata = gzcompress($data);        $zdata = substr(substr($zdata, 0, strlen($zdata)- 4), 2);        $c_len = strlen($zdata);        $fr .= pack(‘V‘, $crc);        $fr .= pack(‘V‘, $c_len);        $fr .= pack(‘V‘, $unc_len);        $fr .= pack(‘v‘, strlen($name));        $fr .= pack(‘v‘, 0);        $fr .= $name;

        $fr .= $zdata;        $fr .= pack(‘V‘, $crc);        $fr .= pack(‘V‘, $c_len);        $fr .= pack(‘V‘, $unc_len);

        $this->datasec [] = $fr;

        $cdrec = "\x50\x4b\x01\x02";        $cdrec .= "\x00\x00";        $cdrec .= "\x14\x00";        $cdrec .= "\x00\x00";        $cdrec .= "\x08\x00";        $cdrec .= $hexdtime;        $cdrec .= pack(‘V‘, $crc);        $cdrec .= pack(‘V‘, $c_len);        $cdrec .= pack(‘V‘, $unc_len);        $cdrec .= pack(‘v‘, strlen($name));        $cdrec .= pack(‘v‘, 0);        $cdrec .= pack(‘v‘, 0);        $cdrec .= pack(‘v‘, 0);        $cdrec .= pack(‘v‘, 0);        $cdrec .= pack(‘V‘, 32);

$cdrec .= pack(‘V‘, $this->old_offset);$this->old_offset += strlen($fr);

$cdrec .= $name;

$this->ctrl_dir[] = $cdrec;}function add_path($path, $l = 0){$d = @opendir($path);$l = $l > 0 ? $l : strlen($path) + 1;while($v = @readdir($d)){if($v == ‘.‘ || $v == ‘..‘){continue;}$v = $path . ‘/‘ . $v;if(is_dir($v)){$this->add_path($v, $l);} else {$this->add_file(file_get_contents($v), substr($v, $l));}        }    }function file(){$data = implode(‘‘, $this->datasec);$ctrldir = implode(‘‘, $this->ctrl_dir);return $data . $ctrldir . $this->eof_ctrl_dir . pack(‘v‘, sizeof($this->ctrl_dir)) . pack(‘v‘, sizeof($this->ctrl_dir)) . pack(‘V‘, strlen($ctrldir)) . pack(‘V‘, strlen($data)) . "\x00\x00";}

function add_files($files){foreach($files as $file){if (is_file($file)){$data = implode("", file($file));$this->add_file($data, $file);}        }    }function output($file){$fp = fopen($file, "w");fwrite($fp, $this->file ());fclose($fp);}}

$id_link = isset($_GET["id_link"]) ? $_GET["id_link"] : ""; //接收前端的get传值

//下面是数据库的操作，根据自己的连接数据库来具体操作$sql = "select t.`id_attachment`,t.`path`,t.`type`,t.`name`,t.`suffix`,t.`size` from t_attachment t where 1=1 and t.delete_flag=‘0‘ and t.`id_link`=:id_link;";$bindings = array(    [‘key‘ => ‘:id_link‘, ‘val‘ => $id_link, ‘type‘ => PDO::PARAM_STR]);//ftp连接登录信息$ftp_user = $ftp_details["user"];$ftp_pass = $ftp_details["pass"];$ftp_host = $ftp_details["host"];//下面是实例操作过程：$dfile = tempnam(‘/tmp‘, ‘tmp‘);//产生一个临时文件，用于缓存下载文件$zip = new zipfile();//----------------------$filename = ‘image‘.md5(‘trejlifd098498534‘.rand(1000,9999)).‘.‘.‘zip‘; //下载的默认文件名

//以下是需要下载的图片数组信息，将需要下载的图片信息转化为类似即可$image = array();for ($i=0;$i<count($results);$i++){$ftp_path = $results[$i]["path"]."/".$results[$i]["id_attachment"];$image[$i][‘image_src‘] = "ftp://{$ftp_user}:{$ftp_pass}@{$ftp_host}{$ftp_path}";$image[$i][‘image_name‘] = ‘img‘.$i.‘.‘.$results[$i]["suffix"];}

foreach($image as $v){$zip->add_file(file_get_contents($v[‘image_src‘]), $v[‘image_name‘]);// 添加打包的图片，第一个参数是图片内容，第二个参数是压缩包里面的显示的名称, 可包含路径    // 或是想打包整个目录 用 $zip->add_path($image_path);}//----------------------$zip->output($dfile);

// 下载文件ob_clean();header(‘Pragma: public‘);header(‘Last-Modified:‘.gmdate(‘D, d M Y H:i:s‘) . ‘GMT‘);header(‘Cache-Control:no-store, no-cache, must-revalidate‘);header(‘Cache-Control:pre-check=0, post-check=0, max-age=0‘);header(‘Content-Transfer-Encoding:binary‘);header(‘Content-Encoding:none‘);header(‘Content-type:multipart/form-data‘);header(‘Content-Disposition:attachment; filename="‘.$filename.‘"‘); //设置下载的默认文件名header(‘Content-length:‘. filesize($dfile));$fp = fopen($dfile, ‘r‘);while(connection_status() == 0 && $buf = @fread($fp, 8192)){echo $buf;}fclose($fp);@unlink($dfile);@flush();@ob_flush();exit();

以上方法你肯定不是拿来就能用的，需要自己去看看每一行的代码注释，修改下参数

原文地址：https://www.cnblogs.com/learningPHP-students2018/p/11008085.html