PHP
PHP多图片打包下载
本篇博客将为大家分享如何将多张图片压缩打包下载
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']), iconv('utf-8', 'GB18030',$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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