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Phar::compressAllFilesGZ is a method in PHP's Phar extension. Its purpose is to compress all files within a Phar archive using the zlib compression algorithm.

Here is a detailed explanation of how to use Phar::compressAllFilesGZ:

1. Create a new Phar archive using the Phar class constructor or by opening an existing Phar archive.
php
$phar = new Phar('/path/to/myphar.phar');

2. Enable buffering to improve performance when adding files to the Phar archive.
php
$phar->startBuffering();

3. Add files to the Phar archive using the Phar::buildFromDirectory() or Phar::addFile() methods.
php
$phar->buildFromDirectory('/path/to/myfiles');

4. After adding all the files, call Phar::compressAllFilesGZ() to compress them using the gzip compression algorithm.
php
$phar->compressAllFilesGZ();

5. Finally, write the Phar archive to the disk using the Phar::stopBuffering() method.
php
$phar->stopBuffering();


This example demonstrates how to create a Phar archive and compress all files within it using the Phar::compressAllFilesGZ method. Please note that you need to have the Phar extension enabled in your PHP configuration for this to work.