php多圖片打包下載

        前天在實現公司一個需求的時候，由於需要提供多圖下載的功能，所以想到了多圖打包壓下載的思路，今天在這裏跟大家分享如何實現這個功能。

       我們先封裝我們的一個壓縮打包下載類，代碼如下：

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);
    }
}

       完成以上基礎類的封裝，下面就是調用方法了，代碼如下：

//將要下載的圖片數組
$image[] = array(
    'image_src' => "圖片地址", 
    'image_name' => "圖片命名"
);
//下面是實例操作過程：
$dfile = tempnam('/tmp', 'tmp');//產生一個臨時文件，用於緩存下載文件
$zip = new zipfile();
//----------------------
$filename = 'image.zip'; //下載的默認文件名

//以下是需要下載的圖片數組信息，將需要下載的圖片信息轉化爲類似即可
foreach ($image as $v) {
    $zip->add_file(file_get_contents($v['image_src']), $v['image_name']);
    // 添加打包的圖片，第一個參數是圖片內容，第二個參數是壓縮包裏面的顯示的名稱, 
     //   可包含路徑
    // 或是想打包整個目錄 用 $zip->add_path($image_path);
}
//----------------------
$zip->output($dfile);

// 下載文件
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');
//設置下載的默認文件名
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，我們便可以成功的進行多圖片下載，小夥伴們只要將我的圖片數組的數據改成你們要下載的圖片的地址跟名字就可以調用了，小夥伴們趕緊試試