吃内存的批量图片打包下载

zipdown.php

<?php
/**
 * 关于文件压缩和下载的类.
 *
 * @author  ymd
 *
 * @version 1.0
 */

namespace app\index\controller;

use think\Controller;

class Zipdown extends Controller
{
    public $datasec = array();
    public $ctrl_dir = array();
    public $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
    public $old_offset = 0;

    public 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);
    }

    public 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;
    }

    public 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));
            }
        }
    }

    public 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";
    }

    public function add_files($files)
    {
        foreach ($files as $file) {
            if (is_file($file)) {
                $data = implode('', file($file));
                $this->add_file($data, $file);
            }
        }
    }

    public function output($file)
    {
        $fp = fopen($file, 'w');
        fwrite($fp, $this->file());
        fclose($fp);
    }
}

test.php

public function downImg(){
    //在windows指定的目录中创建一个具有唯一文件名的临时文件夹，用于缓存下载文件
    $dfile =  tempnam('/tmp', 'tmp');
    dump($dfile);
    $filename = '二维码'.date("Y-m-d H:i:s",time()).'.zip'; //下载的默认文件名
    //创建对象
    $zip = new Zipdown();
    //以下是需要下载的图片数组信息，将需要下载的图片信息转化为类似即可
    //$params['ids'] = explode(',',$params['ids']);
    $image = array(
        array('image_src' => 'D:\wamp64\www\tp5\public\images\3.jpg', 'image_name' => 'pic/图片1.jpg'),
        array('image_src' => 'D:\wamp64\www\tp5\public\images\yahoo.gif', 'image_name' => 'pic/图片2.jpg'),
    );

    foreach($image as $v){
        // 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);
        $zip->add_file(file_get_contents($v['image_src']),  iconv('utf-8', 'gbk//ignore', $v['image_name']));
    }
    //写入文件
    $zip->output($dfile);

    // 下载文件
    //销毁缓冲区的内容
    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');
    //把请求所得的内容存为一个文件的时候提供一个默认的文件名
    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();
}