Zip decompression library in PHP8.0: ZipArchive

As a popular server-side programming language, PHP has been widely used and supported. The new Zip decompression library in the PHP8.0 version is also a very practical feature that can provide PHP developers with more programming tools and solutions.

This Zip decompression library is called ZipArchive, which is a newly introduced Zip decompression and compression class in PHP 8.0 version. This feature can help developers solve the problem of Zip file operations in PHP and provide a simpler, faster, and more effective solution, allowing developers to develop and manage projects more easily.

Before using the ZipArchive function, you can turn on the Zip extension function in the configuration file and enable ZipArchive support. The method of using ZipArchive is similar to the operation of ordinary PHP objects. Let's introduce it in detail below.

1. ZipArchive workflow

ZipArchive is a namespace class that can be called in the PHP namespace. The basic workflow of ZipArchive is as follows:

• First, create a ZipArchive object and use the open() method to open the Zip file to be operated or create a new Zip file;
• Then, use addFile () method to add files to the Zip file, or you can use the addFromString() method to add string data to the Zip file;
• Finally, use the close() method to close the Zip file.

ZipArchive can open Zip files in two modes: read mode and write mode. If the Zip file is opened in writing mode, you can add file or string data to the Zip file and compress the Zip file; if the Zip file is opened in reading mode, you can only read the Zip file. The data in the file cannot be added or modified to the Zip file.

2. Common methods of ZipArchive

ZipArchive provides many practical methods. Let’s introduce some common methods in detail.

1. Create ZipArchive object

To use the ZipArchive function, you first need to create a ZipArchive object. You can use the following statement to create a ZipArchive object.

$zip = new ZipArchive();

2. Open Zip file

There are two modes for opening Zip file: read mode and write mode. If you need to write or modify a Zip file, you need to open the Zip file in writing mode. Zip files can be opened using the following methods.

$zip->open($filename, $mode);

Among them, $filename is the path and file name of the Zip file, $mode is the read mode or write mode, and the value is ZipArchive::CREATE or ZipArchive::OVERWRITE. ZipArchive::CREATE means to create a Zip file if the Zip file does not exist, and ZipArchive::OVERWRITE means to overwrite the original Zip file if the Zip file exists.

3. Add files to Zip files

ZipArchive provides multiple methods to add files or string data to Zip files. Among them, the addFile() method can add a file to the Zip file, and the addFromString() method can add string data to the Zip file. Use the addFile() method to add local files and the addFromString() method to add strings.

$zip->addFile($filename, $localname);
$zip->addFromString($localname, $contents);

Among them, $filename is the full path and file name of the file to be added, $localname is the file name in the Zip file, and $contents is the string to be added.

4. Close Zip file

Use the close() method to close the Zip file and complete the operation on the Zip file.

$zip->close();

5. Read the content from the Zip file

If the mode of opening the Zip file is read mode, you can use the following method to read the content from the Zip file.

$zip->getFromName($name);

Among them, $name specifies the file name in the Zip file to be read.

3. Cases of using ZipArchive

Let’s take a look at a specific case to show the process of using ZipArchive. This case is to compress the image file into a Zip file and save the Zip file to the server.

$dir = './images';  // 图片目录
$zipname = 'images.zip';  // 压缩文件名

// 创建ZipArchive对象
$zip = new ZipArchive();

// 打开要写入的Zip文件
if ($zip->open($zipname, ZipArchive::CREATE) !== TRUE) {
  exit("无法创建Zip文件
");
}

// 从目录中读取文件，并将其添加到Zip文件中
if ($handle = opendir($dir)) {
  while (false !== ($entry = readdir($handle))) {
    if ($entry != "." && $entry != "..") {
      $zip->addFile($dir.'/'.$entry, $entry);
    }
  }
  closedir($handle);
}

// 关闭Zip文件
$zip->close();

// 将Zip文件保存到服务器
header('Content-Type: application/zip');
header('Content-Disposition: attachment; filename="'.basename($zipname).'"');
header('Content-Length: ' . filesize($zipname));
readfile($zipname);

// 清理Zip文件
unlink($zipname);

In this case, first specify the image directory to be compressed and the name of the Zip file to be created. Then, create a ZipArchive object, open the Zip file, and add the image files in the directory to the Zip file. Finally, save the Zip file to the server and send it to the user for download. Finally, you need to clean up the Zip file and delete the Zip files saved on the server.

4. Summary

ZipArchive is a very practical function introduced in PHP8.0 version, which can make it easier for PHP developers to operate and manage Zip files. The method provided by ZipArchive is simple and practical, you can easily add file or string data to Zip files, and you can also read the data in Zip files. Zip files can be easily created and managed using ZipArchive, bringing more convenience and efficiency to PHP programming.

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