How does PHP ZipArchive modify the properties of files in a compressed package?

PHP ZipArchive is an extension library for creating, reading and modifying ZIP compressed files. It provides a series of methods to modify the properties of files in the compressed package.

First, we need to create a ZipArchive object and load the compressed package file to be modified. Here is an example:

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

Next, we can use the statIndex method to get the attributes of the file at a specific index in the compressed package. This method returns an associative array containing various information about the file attributes. Here is an example:

$fileIndex = 0; // 假设要修改的文件位于压缩包的第一个索引位置
$fileInfo = $zip->statIndex($fileIndex);

// 输出文件原始属性
echo "文件名: " . $fileInfo['name'] . "
";
echo "压缩前的文件大小: " . $fileInfo['size'] . " 字节
";
echo "最后修改时间: " . date('Y-m-d H:i:s', $fileInfo['mtime']) . "
";
echo "权限: " . $fileInfo['external'] . "
";

To modify the attributes of a file, we can use the setExternalAttributesIndex method. This method accepts two parameters: the file index to be modified and the new attribute value. Property values ​​are usually represented in octal notation, which include file permissions and last modification time. Here is an example:

$newPermissions = 0777; // 新的文件权限，这里给予最高权限
$newModifiedTime = time(); // 新的最后修改时间，这里设为当前时间

$zip->setExternalAttributesIndex($fileIndex, ($newPermissions << 16) | ($newModifiedTime & 0xFFFF));

// 确认属性修改生效
$fileInfo = $zip->statIndex($fileIndex);
echo "修改后的文件权限: " . $fileInfo['external'] . "
";
echo "修改后的最后修改时间: " . date('Y-m-d H:i:s', $fileInfo['mtime']) . "
";

In this example, we use bitwise operators to combine the new file permissions and the last modification time, and pass the combined value to the setExternalAttributesIndex method .

Finally, don’t forget to save the modified compressed package file. We can use the close method to close the ZipArchive object and save the modified file to disk. The following is an example:

$zip->close();

To sum up, PHP ZipArchive provides a very convenient method for modifying the properties of files in the compressed package. We can easily accomplish this task by using statIndex to get the original attributes, using setExternalAttributesIndex to modify the attributes, and finally using close to save the modified zip file . Hope this article helps you!

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