How does PHP ZipArchive enable viewing of attributes of files in compressed packages?

PHP ZipArchive How to view the properties of files in a compressed package?

[Introduction]
In PHP, we often need to handle various file operations, one of which is processing compressed package files. ZipArchive is a powerful extension library provided by PHP, which can be used to create, open, and decompress compressed archive files in ZIP format. This article will introduce how to use ZipArchive to view the properties of files in compressed packages.

[Introduction to ZipArchive]
ZipArchive is a class located in the PHP Zip extension. It provides a set of methods to process files in ZIP format. By using ZipArchive, we can easily perform various operations on ZIP files, such as creating, opening, decompressing, adding files, deleting files, etc.

[View the properties of the files in the compressed package]
In the ZipArchive class, some methods for viewing the properties of the files in the compressed package are provided, as follows:

1. getNameIndex($index): Get the file name at the specified index position.
2. getStatIndex($index): Get the file information at the specified index position.
3. getExternalAttributesIndex($index, &$opsys, &$attr): Get the external file attributes at the specified index position.

Next, we will introduce examples of using these methods one by one.

[Usage Example]

1. getNameIndex($index) method example:

$zip = new ZipArchive();
$zip->open('files.zip');

$index = 0; // 第一个文件的索引位置
$filename = $zip->getNameIndex($index);
echo "文件名称：$filename";

$zip->close();

In the above example, we first create a ZipArchive object, and Call the open method to open the compressed package file named 'files.zip'. Then, by calling the getNameIndex method and passing in index position 0, we can get the name of the first file and print the output.

2. getStatIndex($index) method example:

$zip = new ZipArchive();
$zip->open('files.zip');

$index = 1; // 第二个文件的索引位置
$fileinfo = $zip->getStatIndex($index);

echo "文件名称：{$fileinfo['name']}";
echo "文件大小：{$fileinfo['size']} bytes";
echo "文件最后修改时间：{$fileinfo['mtime']}";
echo "文件最后访问时间：{$fileinfo['atime']}";
echo "文件最后创建时间：{$fileinfo['ctime']}";

$zip->close();

In the above example, we also opened a compressed package file named 'files.zip', and Obtain the information of the second file by calling the getStatIndex method. Then, we printed out the file name, size, last modification time, last access time and last creation time.

3. getExternalAttributesIndex($index, &$opsys, &$attr) method example:

$zip = new ZipArchive();
$zip->open('files.zip');

$index = 2; // 第三个文件的索引位置
$opsys = null;
$attr = null;

$zip->getExternalAttributesIndex($index, $opsys, $attr);

echo "操作系统标识：$opsys";
echo "文件属性：$attr";

$zip->close();

In the above example, we also opened a file named 'files. zip' compressed package file, and obtain the operating system identifier and file attributes of the third file by calling the getExternalAttributesIndex method. Then, we printed out the operating system identification and file attributes respectively.

[Summary]
This article introduces how to use the methods provided by the ZipArchive class to implement the attribute viewing function of files in the compressed package. By using methods such as getNameIndex, getStatIndex and getExternalAttributesIndex, we can easily obtain file names, file information, file attributes, etc. The flexible use of these methods can help us better handle ZIP format compressed package files.

[Reference Materials]

1. PHP official documentation - ZipArchive class: https://www.php.net/manual/zh/class.ziparchive.php

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