php边压缩边下载

2022-03-05T02:12:00+08:00

php实现边压缩边下载，原理大概就是，每压缩一个文件就输出给浏览器。实现压缩与下载同步进行。1.关键代码如下setDoWrite(); $data1; define('BASE_PATH',str_replace('\\','/',realpath(dirname(__FILE__).'/'))."/");//去当前执行文件绝对路径 //define('WWWROOT',$_SERVER['DOCUMENT_ROOT']."/");//网站根目录,如果需要用这个直接屏蔽上面一行代码用这个变量把下面BASE_PATH替换成WWWROOT即可 $lj=BASE_PATH."bbb";//设置需要打包的目录,方便下面替换避免压缩包把整个路径的文件夹创建 $filearr1 = list_file($lj);//所有待压缩的文件数组，一般只存路径即可 $filearr=toOneArray($filearr1);//多维数组改为一维数组 foreach ($filearr as $key => $value) { try{ //此处可以添加用户连接判断，若是用户取消了下载或断开了链接就终止操作 $url = $value; $file= file_get_contents($url);//获取文件内容，用file_get_content即可，这个是我自己封装的 $value=str_replace($lj."/", "", $value);//替换路径避免压缩包多余路径文件夹 $zip->addFile($file,iconv("utf-8","gbk",$value));//调用类的addFile开始压缩 ob_flush();//输出本次压缩的文件 }catch(Exception $e){ log($e); } } //输出zip文件尾部 $zip->file(); flush();//结束上传，缺少可能会引起压缩文件打不开 function list_file($date){ //1、首先先读取文件夹 $temp=scandir($date); //遍历文件夹 foreach($temp as $v){ $a=$date.'/'.$v; if($v=='.' || $v=='..'){//判断是否为系统隐藏的文件.和.. 如果是则跳过否则就继续往下走，防止无限循环再这里。 continue; } if(is_dir($a)){//如果是文件夹则执行 $data1[] = list_file($a);//因为是文件夹所以再次调用自己这个函数，把这个文件夹下的文件遍历出来 }else{ $data1[]=["imgpath"=>$a]; //加入到数组里准备返回(特别上面那个他是调用自身那么他也会返回多维数组出来) } } return $data1; } function toOneArray($array) { static $res_arr = []; foreach ($array as $v) { if (is_array($v)) { toOneArray($v); } else { $res_arr[] = $v; } } return $res_arr; } ?>2.引入压缩文件类zip.class.php，是phpMyadmin的压缩方法 file * * @var boolean $doWrite */ var $doWrite = false; /** * Array to store compressed data * * @var array $datasec */ var $datasec = array(); /** * Central directory * * @var array $ctrl_dir */ var $ctrl_dir = array(); /** * End of central directory record * * @var string $eof_ctrl_dir */ var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; /** * Last offset position * * @var integer $old_offset */ var $old_offset = 0; /** * Sets member variable this -> doWrite to true * - Should be called immediately after class instantiantion * - If set to true, then ZIP archive are echo'ed to STDOUT as each * file is added via this -> addfile(), and central directories are * echoed to STDOUT on final call to this -> file(). Also, * this -> file() returns an empty string so it is safe to issue a * "echo $zipfile;" command * * @access public * * @return void */ function setDoWrite() { $this -> doWrite = true; } // end of the 'setDoWrite()' method /** * Converts an Unix timestamp to a four byte DOS date and time format (date * in high two bytes, time in low two bytes allowing magnitude comparison). * * @param integer $unixtime the current Unix timestamp * * @return integer the current date in a four byte DOS format * * @access private */ function unix2DosTime($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; $timearray['seconds'] = 0; } // end if return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) | ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1); } // end of the 'unix2DosTime()' method /** * Adds "file" to archive * * @param string $data file contents * @param string $name name of the file in the archive (may contains the path) * @param integer $time the current timestamp * * @access public * * @return void */ function addFile($data, $name, $time = 0) { $name = str_replace('\\', '/', $name); $dtime = substr("00000000" . dechex($this->unix2DosTime($time)), -8); $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"; // ver needed to extract $fr .= "\x00\x00"; // gen purpose bit flag $fr .= "\x08\x00"; // compression method $fr .= $hexdtime; // last mod time and date // "local file header" segment $unc_len = strlen($data); $crc = crc32($data); $zdata = gzcompress($data); $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug $c_len = strlen($zdata); $fr .= pack('V', $crc); // crc32 $fr .= pack('V', $c_len); // compressed filesize $fr .= pack('V', $unc_len); // uncompressed filesize $fr .= pack('v', strlen($name)); // length of filename $fr .= pack('v', 0); // extra field length $fr .= $name; // "file data" segment $fr .= $zdata; // echo this entry on the fly, ... if ( $this -> doWrite) { echo $fr; } else { // ... OR add this entry to array $this -> datasec[] = $fr; } // now add to central directory record $cdrec = "\x50\x4b\x01\x02"; $cdrec .= "\x00\x00"; // version made by $cdrec .= "\x14\x00"; // version needed to extract $cdrec .= "\x00\x00"; // gen purpose bit flag $cdrec .= "\x08\x00"; // compression method $cdrec .= $hexdtime; // last mod time & date $cdrec .= pack('V', $crc); // crc32 $cdrec .= pack('V', $c_len); // compressed filesize $cdrec .= pack('V', $unc_len); // uncompressed filesize $cdrec .= pack('v', strlen($name)); // length of filename $cdrec .= pack('v', 0); // extra field length $cdrec .= pack('v', 0); // file comment length $cdrec .= pack('v', 0); // disk number start $cdrec .= pack('v', 0); // internal file attributes $cdrec .= pack('V', 32); // external file attributes // - 'archive' bit set $cdrec .= pack('V', $this -> old_offset); // relative offset of local header $this -> old_offset += strlen($fr); $cdrec .= $name; // optional extra field, file comment goes here // save to central directory $this -> ctrl_dir[] = $cdrec; } // end of the 'addFile()' method /** * Echo central dir if ->doWrite==true, else build string to return * * @return string if ->doWrite {empty string} else the ZIP file contents * * @access public */ function file() { $ctrldir = implode('', $this -> ctrl_dir); $header = $ctrldir . $this -> eof_ctrl_dir . pack('v', sizeof($this -> ctrl_dir)) . //total #of entries "on this disk" pack('v', sizeof($this -> ctrl_dir)) . //total #of entries overall pack('V', strlen($ctrldir)) . //size of central dir pack('V', $this -> old_offset) . //offset to start of central dir "\x00\x00"; //.zip file comment length if ( $this -> doWrite ) { // Send central directory & end ctrl dir to STDOUT echo $header; return ""; // Return empty string } else { // Return entire ZIP archive as string $data = implode('', $this -> datasec); return $data . $header; } } // end of the 'file()' method } // end of the 'ZipFile' class ?>

PHP压缩和解压代码段

2022-02-25T18:59:25+08:00

[scode type="green"]PHP文件 Zip 压缩[/scode]open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) { return false; } //add the files foreach ($valid_files as $file) { $zip->addFile($file,$file); } //debug //echo 'The zip archive contains ',$zip->numFiles,' files with a status of ',$zip->status; //close the zip -- done! $zip->close(); //check to make sure the file exists return file_exists($destination); } else { return false; } } /***** Example Usage ***/ $files = array('file1.jpg', 'file2.jpg', 'file3.gif'); create_zip($files, 'myzipfile.zip', true); ?>[scode type="green"]PHP解压缩 Zip文件[/scode]open($file) !== TRUE) { die ('Could not open archive'); } // extract contents to destination directory $zip->extractTo($destination); // close archive $zip->close(); echo 'Archive extracted to directory'; } ?>

修改qcow2文件镜像和压缩的教程

2022-02-23T17:09:00+08:00

一、修改镜像内容步骤guestfish --rw -a qcow2 #镜像文件绝对路径（例子：guestfish --rw -a /home/kvm/images/CentOS-7.8.2003-x64.qcow2）进入后先执行run；随后执行list-filesystems 查看分区信息；以魔方centos7.8镜像为例，分区信息为 /dev/sda1: ext4 ，执行mount /dev/sda1 / 进行分区挂载；接下来可以修改任意文件，例如操作ssh登录提示 vi /etc/motd 执行exit 退出目前发现一个重点问题：在挂载xfs分区时会出现分区格式不兼容的情况。例如CentOS8官方的云镜像，默认是xfs分区格式，CentOS8与CentOS7的xfs格式不相同，会出现兼容问题运行不成功或挂载不成功，请注意区分。1.另外一种挂载到宿主机目录方式guestmount -a qcow2 -m 分区 /宿主机目录 #镜像文件绝对路径（例子：guestmount -a /home/kvm/images/CentOS-7.8.2003-x64.qcow2 -m /dev/sda1 /mnt） #卸载命令 guestunmount /mnt二、清除磁盘空洞virt-sparsify -x 原qcow2镜像文件路径 --convert qcow2 新qcow2镜像文件路径（例子：virt-sparsify -x /home/kvm/images/CentOS-7.8.2003-x64.qcow2 --convert qcow2 /home/kvm/images/tmp.qcow2）如果出错提示tmp不足可以参考下面这个文章[post cid="134" /]操作完成后，可先进行重装验证是否可以正常引导启动，最后修改新qcow2镜像文件名称三、对qcow2镜像文件进行打包压缩qemu-img convert -c -O qcow2 需要压缩的镜像文件路径压缩后的镜像文件路径（例子：qemu-img convert -c -O qcow2 /home/kvm/images/tmp.qcow2 /home/kvm/images/CentOS-7.8.2003-x64.qcow2）

闲者博客 - 压缩

php边压缩边下载

PHP压缩和解压代码段

修改qcow2文件镜像和压缩的教程