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authorAndrey Andreev <narf@devilix.net>2019-09-19 14:08:45 +0200
committerAndrey Andreev <narf@devilix.net>2019-09-19 14:08:45 +0200
commitb73eb19aed66190c10c9cad476da7c36c271d6dc (patch)
treeb3d5d4f960569c30701934416d6d51628bde81a7 /user_guide_src/source/libraries/zip.rst
parent6e052d80b95b9332ed592cdc3431b5f9dc8dd250 (diff)
[ci skip] 3.1.11 release
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-##################
-Zip Encoding Class
-##################
-
-CodeIgniter's Zip Encoding Class permits you to create Zip archives.
-Archives can be downloaded to your desktop or saved to a directory.
-
-.. contents::
- :local:
-
-.. raw:: html
-
- <div class="custom-index container"></div>
-
-****************************
-Using the Zip Encoding Class
-****************************
-
-Initializing the Class
-======================
-
-Like most other classes in CodeIgniter, the Zip class is initialized in
-your controller using the $this->load->library function::
-
- $this->load->library('zip');
-
-Once loaded, the Zip library object will be available using::
-
- $this->zip
-
-Usage Example
-=============
-
-This example demonstrates how to compress a file, save it to a folder on
-your server, and download it to your desktop.
-
-::
-
- $name = 'mydata1.txt';
- $data = 'A Data String!';
-
- $this->zip->add_data($name, $data);
-
- // Write the zip file to a folder on your server. Name it "my_backup.zip"
- $this->zip->archive('/path/to/directory/my_backup.zip');
-
- // Download the file to your desktop. Name it "my_backup.zip"
- $this->zip->download('my_backup.zip');
-
-***************
-Class Reference
-***************
-
-.. php:class:: CI_Zip
-
- .. attribute:: $compression_level = 2
-
- The compression level to use.
-
- It can range from 0 to 9, with 9 being the highest and 0 effectively disabling compression::
-
- $this->zip->compression_level = 0;
-
- .. php:method:: add_data($filepath[, $data = NULL])
-
- :param mixed $filepath: A single file path or an array of file => data pairs
- :param array $data: File contents (ignored if $filepath is an array)
- :rtype: void
-
- Adds data to the Zip archive. Can work both in single and multiple files mode.
-
- When adding a single file, the first parameter must contain the name you would
- like given to the file and the second must contain the file contents::
-
- $name = 'mydata1.txt';
- $data = 'A Data String!';
- $this->zip->add_data($name, $data);
-
- $name = 'mydata2.txt';
- $data = 'Another Data String!';
- $this->zip->add_data($name, $data);
-
- When adding multiple files, the first parameter must contain *file => contents* pairs
- and the second parameter is ignored::
-
- $data = array(
- 'mydata1.txt' => 'A Data String!',
- 'mydata2.txt' => 'Another Data String!'
- );
-
- $this->zip->add_data($data);
-
- If you would like your compressed data organized into sub-directories, simply include
- the path as part of the filename(s)::
-
- $name = 'personal/my_bio.txt';
- $data = 'I was born in an elevator...';
-
- $this->zip->add_data($name, $data);
-
- The above example will place my_bio.txt inside a folder called personal.
-
- .. php:method:: add_dir($directory)
-
- :param mixed $directory: Directory name string or an array of multiple directories
- :rtype: void
-
- Permits you to add a directory. Usually this method is unnecessary since you can place
- your data into directories when using ``$this->zip->add_data()``, but if you would like
- to create an empty directory you can do so::
-
- $this->zip->add_dir('myfolder'); // Creates a directory called "myfolder"
-
- .. php:method:: read_file($path[, $archive_filepath = FALSE])
-
- :param string $path: Path to file
- :param mixed $archive_filepath: New file name/path (string) or (boolean) whether to maintain the original filepath
- :returns: TRUE on success, FALSE on failure
- :rtype: bool
-
- Permits you to compress a file that already exists somewhere on your server.
- Supply a file path and the zip class will read it and add it to the archive::
-
- $path = '/path/to/photo.jpg';
-
- $this->zip->read_file($path);
-
- // Download the file to your desktop. Name it "my_backup.zip"
- $this->zip->download('my_backup.zip');
-
- If you would like the Zip archive to maintain the directory structure of
- the file in it, pass TRUE (boolean) in the second parameter. Example::
-
- $path = '/path/to/photo.jpg';
-
- $this->zip->read_file($path, TRUE);
-
- // Download the file to your desktop. Name it "my_backup.zip"
- $this->zip->download('my_backup.zip');
-
- In the above example, photo.jpg will be placed into the *path/to/* directory.
-
- You can also specify a new name (path included) for the added file on the fly::
-
- $path = '/path/to/photo.jpg';
- $new_path = '/new/path/some_photo.jpg';
-
- $this->zip->read_file($path, $new_path);
-
- // Download ZIP archive containing /new/path/some_photo.jpg
- $this->zip->download('my_archive.zip');
-
- .. php:method:: read_dir($path[, $preserve_filepath = TRUE[, $root_path = NULL]])
-
- :param string $path: Path to directory
- :param bool $preserve_filepath: Whether to maintain the original path
- :param string $root_path: Part of the path to exclude from the archive directory
- :returns: TRUE on success, FALSE on failure
- :rtype: bool
-
- Permits you to compress a directory (and its contents) that already exists somewhere on your server.
- Supply a path to the directory and the zip class will recursively read and recreate it as a Zip archive.
- All files contained within the supplied path will be encoded, as will any sub-directories contained within it. Example::
-
- $path = '/path/to/your/directory/';
-
- $this->zip->read_dir($path);
-
- // Download the file to your desktop. Name it "my_backup.zip"
- $this->zip->download('my_backup.zip');
-
- By default the Zip archive will place all directories listed in the first parameter
- inside the zip. If you want the tree preceding the target directory to be ignored,
- you can pass FALSE (boolean) in the second parameter. Example::
-
- $path = '/path/to/your/directory/';
-
- $this->zip->read_dir($path, FALSE);
-
- This will create a ZIP with a directory named "directory" inside, then all sub-directories
- stored correctly inside that, but will not include the */path/to/your* part of the path.
-
- .. php:method:: archive($filepath)
-
- :param string $filepath: Path to target zip archive
- :returns: TRUE on success, FALSE on failure
- :rtype: bool
-
- Writes the Zip-encoded file to a directory on your server. Submit a valid server path
- ending in the file name. Make sure the directory is writable (755 is usually OK).
- Example::
-
- $this->zip->archive('/path/to/folder/myarchive.zip'); // Creates a file named myarchive.zip
-
- .. php:method:: download($filename = 'backup.zip')
-
- :param string $filename: Archive file name
- :rtype: void
-
- Causes the Zip file to be downloaded from your server.
- You must pass the name you would like the zip file called. Example::
-
- $this->zip->download('latest_stuff.zip'); // File will be named "latest_stuff.zip"
-
- .. note:: Do not display any data in the controller in which you call
- this method since it sends various server headers that cause the
- download to happen and the file to be treated as binary.
-
- .. php:method:: get_zip()
-
- :returns: Zip file content
- :rtype: string
-
- Returns the Zip-compressed file data. Generally you will not need this method unless you
- want to do something unique with the data. Example::
-
- $name = 'my_bio.txt';
- $data = 'I was born in an elevator...';
-
- $this->zip->add_data($name, $data);
-
- $zip_file = $this->zip->get_zip();
-
- .. php:method:: clear_data()
-
- :rtype: void
-
- The Zip class caches your zip data so that it doesn't need to recompile the Zip archive
- for each method you use above. If, however, you need to create multiple Zip archives,
- each with different data, you can clear the cache between calls. Example::
-
- $name = 'my_bio.txt';
- $data = 'I was born in an elevator...';
-
- $this->zip->add_data($name, $data);
- $zip_file = $this->zip->get_zip();
-
- $this->zip->clear_data();
-
- $name = 'photo.jpg';
- $this->zip->read_file("/path/to/photo.jpg"); // Read the file's contents
-
- $this->zip->download('myphotos.zip');