How does PHP ZipArchive modify and update files in compressed packages?

PHP ZipArchive is a class used to create, open and modify zip compressed files. It provides a set of methods to easily modify and update files in compressed packages. Below we will introduce how to use the PHP ZipArchive class to modify and update the files in the compressed package.

First, we need to open a zip archive and get the file list inside. Use the open() method of ZipArchive to open a zip archive and return a ZipArchive object. We can get the contents of the specified file name by calling the getFromName() method.

$zip = new ZipArchive;
$res = $zip->open('example.zip');
if ($res === TRUE) {
    $content = $zip->getFromName('example.txt');
    echo $content;
    $zip->close();
} else {
    echo '无法打开压缩包';
}

The above code opens a compressed package named example.zip and reads the contents of the file named example.txt. Next we will introduce how to add or replace files to the compressed package.

To add files to the compressed package, we can use the addFile() method. It accepts two parameters, the first parameter is the path of the file to be added, and the second parameter is the path of the file in the compressed package.

$zip = new ZipArchive;
$res = $zip->open('example.zip');
if ($res === TRUE) {
    $zip->addFile('newfile.txt', 'newfile.txt');
    $zip->close();
    echo '文件添加成功';
} else {
    echo '无法打开压缩包';
}

The above code adds a file named newfile.txt to the example.zip compressed package and places it in the root directory of the compressed package.

If you want to replace the file in the compressed package, you can use the replaceFile() method. It accepts two parameters, the first parameter is the path of the file to be replaced, and the second parameter is the path of the file in the compressed package.

$zip = new ZipArchive;
$res = $zip->open('example.zip');
if ($res === TRUE) {
    $zip->replaceFile('newfile.txt', 'example.txt');
    $zip->close();
    echo '文件替换成功';
} else {
    echo '无法打开压缩包';
}

The above code replaces the file named example.txt in the example.zip compressed package with the newfile.txt file.

In addition to adding and replacing files, ZipArchive also provides other methods, such as deleting files, renaming files, etc. You can choose the appropriate method according to your needs to modify and update the files in the compressed package.

In short, the PHP ZipArchive class provides us with a convenient method to modify and update the files in the compressed package. You can use the addFile() and replaceFile() methods to add and replace files, and you can also use other methods to delete files, rename files, etc. Hope this article can help you.

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