How to use PHP ZipArchive to divide and merge compressed packages?

How to use PHP ZipArchive to divide and merge compressed packages?

Introduction:
In the actual development process, sometimes we need to process large files or a large number of files. At this time, compressing a file collection is a more common way. However, in some cases, due to system limitations or other reasons, we may need to split a large compressed file into multiple smaller files, or merge multiple smaller compressed files into one large compressed file. This article will introduce how to use PHP's ZipArchive library to implement volume splitting and merging operations on compressed packages.

1. Volume splitting operation:
To realize the splitting operation of the compressed package, the following steps need to be performed:

1. Create the ZipArchive object:
   First, we need Create a ZipArchive object for opening and operating compressed packages. When creating an object, you need to use the open method to open a new or existing compressed file.

$zip = new ZipArchive;
$res = $zip->open('archive.zip', ZipArchive::CREATE);
if ($res === TRUE) {
    // Success
} else {
    // Failed
}

2. Set the volume size:
   Before performing the volume operation, we need to set the size of the volume. You can set the size of the sub-volume as needed, and the unit can be K, M, G, etc. For example, set the volume size to 100M:

$volume_size = 100; // 分卷大小（单位：M）
$volume_size_bytes = $volume_size * 1024 * 1024; // 分卷大小（字节数）

3. Process the file list:
   Next, we need to obtain the list of files to be compressed and divide them according to the volume size. You can use the glob function to obtain the file list in a directory, and use the array_chunk function to divide the file list into multiple sub-arrays according to the volume size.

$files = glob('path/to/files/*'); // 获取待压缩文件列表
$files_chunks = array_chunk($files, $volume_size_bytes); // 根据分卷大小划分文件数组

4. Volume compression:
   Now we can perform volume compression operation. Loop through the file array and add the files in each sub-array to the compressed package in turn.

$i = 1; // 计数器
foreach ($files_chunks as $chunk) {
    $zip->addFiles($chunk, 'volume_' . $i); // 添加文件到压缩包中，文件夹名为volume_1、volume_2...
    $i++;
}

5. Close the compressed package:
   After completing all volume splitting operations, you need to call the close method to close the compressed package.

$zip->close();

At this point, we have completed the volume splitting operation of the compressed package. Each volume is the specified size and can be decompressed and merged correctly.

2. Merge operation:
To implement the merging operation of compressed packages, the following steps need to be performed:

1. Create a ZipArchive object:
   Similarly, we need to create a ZipArchive object, used to open and operate compressed archives. When creating an object, use the open method to open a new compressed file.

$zip = new ZipArchive;
$res = $zip->open('merged.zip', ZipArchive::CREATE);
if ($res === TRUE) {
    // Success
} else {
    // Failed
}

2. Get the list of volume files:
   Before performing the merge operation, we first need to obtain the list of volume files. You can use the glob function to obtain all volume files in a directory.

$volume_files = glob('path/to/volumes/volume_*'); // 获取分卷文件列表

3. Merge compressed packages:
   Now we can merge the compressed packages. Loop through the volume file list, decompress the contents of each volume file and add it to the merged compressed package.

foreach ($volume_files as $volume_file) {
    $zip->open($volume_file); // 打开分卷压缩包
    $zip->extractTo('path/to/merge'); // 解压到指定目录
    $zip->close(); // 关闭压缩包
}

4. Close the merged compressed package:
   After completing all the merging operations, you need to call the close method to close the merged compressed package.

$zip->close();

At this point, we have completed the merging of compressed packages. All volume files have been correctly decompressed and merged into a single archive.

Conclusion:
Using PHP's ZipArchive library, we can easily realize the partitioning and merging operations of compressed packages. Through the above steps, we can split a large compressed file into multiple smaller files, or merge multiple smaller compressed files into one large compressed file. This is useful when working with large files or a large number of files. I hope this article can be helpful to your development work.

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