How does PHP ZipArchive modify the date and time of files in a compressed package?

How does PHP ZipArchive modify the date and time of the files in the compressed package?

Overview:
During development, sometimes it is necessary to modify the date and time of the files in the compressed package (zip file). PHP provides the ZipArchive class to operate compressed packages. We can use this class to modify the date and time of files in compressed packages. The following will introduce how to use PHP's ZipArchive class to implement this function, and provide corresponding code examples.

Code example:
First, we need to create a ZipArchive object and open the compressed package to be modified. The code is as follows:

$zip = new ZipArchive;
$zip_file = 'path_to_zip_file.zip';

if ($zip->open($zip_file) === TRUE) {
    // 打开压缩包成功
} else {
    // 打开压缩包失败
    exit('Unable to open the zip file.');
}

Next, we need to traverse the files in the compressed package and modify the date and time of the files one by one. The code is as follows:

for ($i=0; $i < $zip->numFiles; $i++) {
    $file_name = $zip->getNameIndex($i);
    $file_datetime = '2022-01-01 00:00:00'; // 修改后的日期时间

    // 获取文件在压缩包中的索引
    $index = $zip->getindex($file_name);

    // 修改文件的日期时间
    $zip->setModificationTime($index, strtotime($file_datetime));
}

Finally, we need to save and close the modified compressed package. The code is as follows:

$zip->close();

echo '压缩包中文件的日期时间已成功修改。';

Note:

• In the code example, $file_datetime is a date and time in the form of a string, which can be changed according to the actual situation to modify.
• When calling $zip->setModificationTime(), the date and time need to be converted into timestamp form, which is implemented through the strtotime() function.
• Before using the setModificationTime() method to modify the date and time of the file, make sure you have obtained the name of the file through the getNameIndex() method and getindex () method obtains the index of the file in the compressed package.

Summary:
Through PHP's ZipArchive class, we can easily modify the date and time of the files in the compressed package. You only need to create a ZipArchive object, open the archive to be modified, traverse the files and modify the date and time one by one, and finally save and close the archive. I hope the above code example can help you when you need to modify the date and time of the files in the compressed package in actual development.

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