PHP function example: folder packaging

In recent years, the packaging and transmission of file data has become a very common operation. In PHP, there are many functions that can be used to handle operations related to files and folders, among which the operation of packaging folders is also very important. Let's discuss how to use PHP functions to implement folder packaging operations.

Before performing specific operations, we need to install the PHP zip module first. If we are under a Linux system, we can use the following command to install: sudo apt-get install php-zip. Under Windows systems, you need to enable the zip extension library first, and the specific operations can be found in the php.ini file; or download the zip library directly from the php.net website, and then configure it in the php.ini file.

1. Example of directory packaging operation

Below we use a specific example to explain how to use PHP functions to package directories.

First, we need to prepare a folder that needs to be packaged. For example, we created a folder named /test, which contains three files: test1.txt, test2.txt and test3 .txt. The following is the directory structure of the folder:

/test
├─test1.txt
├─test2.txt
└─test3.txt

Next, we You need to use a PHP function to package the directory. The code is as follows:

<?php
    // 打包文件夹
    function create_zip($source, $destination) {
        // 检查待打包目录是否存在
        if (!file_exists($source)) {
            return false;
        }

        // 初始化zip对象
        $zip = new ZipArchive();
        if (!$zip->open($destination, ZipArchive::CREATE)) {
            return false;
        }

        // 递归添加目录中的所有文件到压缩包中
        $source = str_replace('\', '/', realpath($source));
        if (is_dir($source) === true) {
            $files = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($source), RecursiveIteratorIterator::SELF_FIRST);
            foreach ($files as $file) {
                $file = str_replace('\', '/', realpath($file));
                if (is_dir($file) === true) {
                    $zip->addEmptyDir(str_replace($source . '/', '', $file . '/'));
                } else if (is_file($file) === true) {
                    $zip->addFromString(str_replace($source . '/', '', $file), file_get_contents($file));
                }
            }
        } else if (is_file($source) === true) {
            $zip->addFromString(basename($source), file_get_contents($source));
        }

        // 关闭zip对象
        $zip->close();
        return file_exists($destination);
    }

    // 调用打包函数进行打包
    create_zip("test", "test.zip");
?>

In this code we define a function named create_zip and pass two parameters: $source and $destination, which represent the needs The packaged folder and packaged file path. The specific steps for packaging are:

1. Check whether the folder to be packaged exists.
2. Initialize the ZipArchive object.
3. Recursively add all files in the directory to the compressed package.
4. Close the ZipArchive object.

The function in this code uses a recursive iterator to recursively add all files in the directory to the compressed package, and uses the addFromString() function to add the name and content of each file to the ZipArchive instance. in the object.

2. Additional file information

When we perform directory packaging operations, we can also add additional file information to it. For example, we can add a one-line declaration for all files that need to be packaged.

The specific code is as follows:

<?php
    // 打包文件夹并加入文件信息
    function create_zip($source, $destination) {
        // 检查待打包目录是否存在
        if (!file_exists($source)) {
            return false;
        }

        // 初始化zip对象
        $zip = new ZipArchive();
        if (!$zip->open($destination, ZipArchive::CREATE)) {
            return false;
        }

        // 添加一句话声明
        $declare = '<?php /** by WordPressChina.org */ ?>';
        $zip->setArchiveComment($declare);

        // 递归添加目录中的所有文件到压缩包中
        $source = str_replace('\', '/', realpath($source));
        if (is_dir($source) === true) {
            $files = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($source), RecursiveIteratorIterator::SELF_FIRST);
            foreach ($files as $file) {
                $file = str_replace('\', '/', realpath($file));
                if (is_dir($file) === true) {
                    $zip->addEmptyDir(str_replace($source . '/', '', $file . '/'));
                } else if (is_file($file) === true) {
                    $zip->addFromString(str_replace($source . '/', '', $file), file_get_contents($file));
                }
            }
        } else if (is_file($source) === true) {
            $zip->addFromString(basename($source), file_get_contents($source));
        }

        // 关闭zip对象
        $zip->close();
        return file_exists($destination);
    }

    // 调用打包函数进行打包并加入文件信息
    create_zip("test", "test.zip");
?>

The main difference between this code and the previous code is the addition of a $declare variable, which is used to store the file information we need to add. Then, we call the setArchiveComment() method to add a line of comments to the compressed package.

3. Summary

Through the above description, we have introduced in detail how to use PHP functions to implement folder packaging operations. Overall, with the help of the PHP ZipArchive extension, we can easily compress and package folders and files and add some additional file information.

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