从 PHP 中的 Phar 存档复制特定目录

Question

All is in the header. My application is stored in Phar. My workflow is really simple.

I work with PHP 5.6 .

I do some stuff in my application and at a moment, I would like to copy a specific directory stored inside my Phar archive into a specific folder outside the archive.

I read lots of things about Phar::extractTo method, but it does not work if I select specific directory. For example:

$phar->extractTo("/external_path", "folder_inside_phar");

shouts me that folder_inside_phar is non-existent file in Phar archive. This function has been declared has buggy because it does not understand folder. It only accepts files for the second argument.

I precise that if I do not mention specific folder, it copies all content of the archive. There is not any problem about Phar access or readonly flag...

So, is there any workaround for that, or a class developed by someone as open-source content to resolve this issue ?

Edit I change the word "extract" by "copy"

Answer 1

Indeed extractTo does not work with reading from a Phar directory directly - so, I'd like to share a potential work around here, basically using the Phar Stream Wrapper phar:// which allows to apply any PHP file function ( file_get_contents , scandir , ...) to Phar archives as well.

Let's assume the Phar builder scripts looks like this (I used addFromString to have a simple example):

<?php
$phar = new Phar('bundle.phar');
$phar->startBuffering();
$phar->addFromString('a/a1.txt', 'contents of a/a1.txt');
$phar->addFromString('a/a2.txt', 'contents of a/a2.txt');
$phar->addFromString('b/b.txt', 'contents of b/b.txt');
$phar->setStub('<?php __HALT_COMPILER();');
$phar->stopBuffering();

Extracting files in directory a/ now could look like the following:

<?php
$targetDirectory = __DIR__ . '/target';
if (!is_dir($targetDirectory)) {
  mkdir($targetDirectory);
}
// read directory using Phar Stream Wrapper
// resolves to `['a1.txt', 'a2.txt']`
$files = scandir('phar://./bundle.phar/a/');
// prefix each file with local path `a/`, e.g. `a1.txt` -> `a/a1.txt`
// resolves to `['a/a1.txt', 'a/a2.txt']`
$files = array_map(function($file) { return 'a/' . $file; }, $files);
// actually extract resolved files to `$targetDirectory`
$phar = new \Phar('./bundle.phar');
$phar->extractTo($targetDirectory, $files);

Thus, the main aspect here is that any file function can be used for stream wrappers as well - eg the following would work as well:

copy('phar://./bundle.phar/b/b.txt', './target/b.txt');