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msd/vendor/desarrolla2/cache/docs/implementations/phpfile.md

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+# PhpFile
+
+Save the cache as PHP script to on the filesystem using 
+[`var_export`](http://php.net/manual/en/function.var-export.php) when storing
+cache and [`include`](http://php.net/manual/en/function.include.php) when
+loading cache.
+
+The implementation leverages the PHP engine’s in-memory file caching (opcache)
+to cache application data in addition to code. This method is particularly fast
+in PHP7.2+ due to opcode cache optimizations.
+
+PHP file caching should primarily be used for arrays and objects. There is no
+performance benefit over APCu for storing strings.
+
+[read more][]
+
+``` php
+use Desarrolla2\Cache\PhpFile as PhpFileCache;
+
+$cache = new PhpFileCache();
+```
+
+### Options
+
+| name      | type               | default        |                                       |
+| --------- | ------------------ | -------------- | ------------------------------------- |
+| ttl       | int                | null           | Maximum time to live in seconds       |
+| prefix    | string             | ""             | Key prefix                            |
+| filename  | string or callable | "%s.php"       | Filename as sprintf format            |
+
+#### Filename option
+
+The `filename` will be parsed using `sprintf` where '%s' is substituted with
+the key.
+
+Instead of a string, `filename` may also be set to a callable, like a callable
+object or closure. In that case the callable will be called to create a
+filename as
+
+    $filename = $callable($key);
+
+##### BasicFilename
+
+The library comes with invokable object as callable for the filename. The
+`BasicFilename` object works as described above.
+
+##### TrieFilename
+
+The `TrieFilename` object will create a prefix tree directory structure. This
+is useful where a lot of cache files would cause to many files in a directory.
+
+Specify the `sprintf` format and the directory level to the constructor when
+creating a `TrieFilename` object.
+
+``` php
+use Desarrolla2\Cache\File as FileCache;
+use Desarrolla2\Cache\File\TrieFilename;
+
+$callback = new TrieFilename('%s.php', 2);
+
+$cache = (new FileCache(sys_get_temp_dir() . '/cache'))
+    ->withOption('filename', $callback);
+```
+
+In this case, adding an item with key `foobar` would be create a file at
+
+    /tmp/cache/f/fo/foobar.php
+
+### Packer
+
+By default the [`NopPacker`](../packers/nop.md) is used. Other packers should
+not be used.
+
+[read more]: https://medium.com/@dylanwenzlau/500x-faster-caching-than-redis-memcache-apc-in-php-hhvm-dcd26e8447ad