How to send and receive compressed packages in volumes through PHP ZipArchive?

How to send and receive compressed packages in volumes through PHP ZipArchive?

In web development, sometimes it is necessary to package large files or multiple files into compressed packages for transmission. However, due to network transmission limitations, sometimes the entire compressed package cannot be sent or received at one time. In order to solve this problem, we can use PHP's ZipArchive class to send and receive compressed packages in volumes.

1. Create a volume compressed package

First, we need to create a compressed package instance and set some basic parameters. Then, we can use the addFile() method to add the files that need to be compressed to the compressed package. After adding all files, use the split() method to split the archive into multiple volumes. Then, we can use the renameIndex() method to change the name of each volume to the specified naming rule. Finally, use the close() method to close the compressed package.

The following is a code example:

$zip = new ZipArchive();
$zip_name = 'files.zip';
$chunk_size = 1024 * 1024; // 分卷大小，默认为1MB
$split_index = 1; // 第一个分卷的索引

if ($zip->open($zip_name, ZipArchive::CREATE) === TRUE) {
    $files = array('file1.jpg', 'file2.png', 'file3.txt');
    
    foreach ($files as $file) {
        $zip->addFile($file);
    }
    
    $zip->split($chunk_size);
    
    for ($i = 0; $i < $zip->numFiles; $i++) {
        $zip->renameIndex($i, $split_index . '_' . $zip->getNameIndex($i));
        $split_index++;
    }
    
    $zip->close();
}

The above code first creates a ZipArchive object, specifies the file name of the compressed package as 'files.zip', and the volume size is 1MB. Then, three files were added to the compressed package. Next, use the split() method to divide the compressed package into multiple volumes, and use the renameIndex() method to change the name of each volume to the specified naming rule. Finally, close the compressed package through the close() method.

2. Receive the compressed package of sub-volumes

The receiving end first needs to integrate all the received sub-volumes into a complete compressed package. We can use the merge() method provided by the ZipArchive class to achieve this. Then, use the extractTo() method to extract the files in the compressed package to the specified directory.

The following is a code example:

$zip = new ZipArchive();
$zip_name = 'files.zip';
$chunk_size = 1024 * 1024; // 分卷大小，默认为1MB
$output_dir = 'output/';

// 获取所有分卷文件
$files = glob('*.zip');

if ($zip->open($zip_name, ZipArchive::CREATE) === TRUE) {
    foreach ($files as $file) {
        $zip->merge($file, $zip->numFiles);
    }
    
    $zip->extractTo($output_dir);
    $zip->close();

    // 删除所有分卷文件
    foreach ($files as $file) {
        unlink($file);
    }
}

The above code first creates a ZipArchive object, specifies the file name of the compressed package as 'files.zip', and the volume size is 1MB. Then, use the glob() function to obtain all volume files. Then, use the merge() method to integrate all volumes into a complete compressed package. Finally, use the extractTo() method to extract the files in the compressed package to the specified output directory. After decompression is completed, delete all volume files through the unlink() function.

Through the above code example, we can use the PHP ZipArchive class to send and receive compressed packages in volumes. This allows for better control and processing of large file transfers, improving transfer efficiency and stability.

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