php多图片打包下载

Myth丶恋晨 2022-03-31 11:40 248阅读 0赞

前天在实现公司一个需求的时候，由于需要提供多图下载的功能，所以想到了多图打包压下载的思路，今天在这里跟大家分享如何实现这个功能。

我们先封装我们的一个压缩打包下载类，代码如下：

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);
        }
    }

完成以上基础类的封装，下面就是调用方法了，代码如下：

//将要下载的图片数组
    $image[] = array(
        'image_src' => "图片地址", 
        'image_name' => "图片命名"
    );
    //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.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
    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');
    //设置下载的默认文件名
    header('Content-Disposition:attachment; filename="' . $filename . '"'); 
    header('Content-length:' . filesize($dfile));
    $fp = fopen($dfile, 'r');
    while (connection_status() == 0 && $buf = @fread($fp, 8192)) {
        echo $buf;
    }
    fclose($fp);
    @unlink($dfile);
    @flush();
    @ob_flush();
    exit();

完成以上所有操作，我们便可以成功的进行多图片下载，小伙伴们只要将我的图片数组的数据改成你们要下载的图片的地址跟名字就可以调用了，小伙伴们赶紧试试

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