Cache

🧬 About Cache

This micropackage is a wrapper for WordPress cache with two drivers implemented:

• WP Object Cache API
• Transients API

It provides a unified, object-oriented way to manipulate WordPress Cache, witch the Cache manipulator object for even easier setting and getting the cache.

💾 Installation

composer require micropackage/cache

🕹 Usage

Object Cache

Constructing the Object Cache driver:

use Micropackage\Cache\Driver\ObjectCache;

$object_cache = new ObjectCache( $group = 'my_group', $expiration = DAY_IN_SECONDS );
$object_cache->set_key( 'cache_key' );

Group parameter allows you to store the cache under the same key across multiple groups. Default is empty string.

By default the expiration is set to 0 which means the transient never expires.

Available methods

Method	Description	Returns
set_key( (string) $key )	Sets the cache key	$this
get_key()	Gets the cache key	(string) Cache key
set_group( (string) $group )	Sets the cache group	$this
get_group	Gets the cache group	(string) Default empty string
set_expiration( (int) $expiration )	Sets the cache expiration in seconds	$this
get_expiration()	Gets the cache expiration	(int) Expiration seconds Default 0 which means the cache doesn't expire
set( (mixed) $value )	Sets the cache	void
add( (mixed) $value )	Sets the cache only if it wasn't set before	void
get()	Gets the cached value	mixed|false False if not set
force_get()	Gets the cached value and updates the local cache from persistent cache	mixed|false False if not set
delete()	Deletes the cache	void

Transient Cache

Constructing the Transient Cache driver:

use Micropackage\Cache\Driver\Transient;

$transient_cache = new Transient( $expiration = DAY_IN_SECONDS );
$transient_cache->set_key( 'cache_key' );

By default the expiration is set to 0 which means the transient never expires.

Available methods

Method	Description	Returns
set_key( (string) $key )	Sets the cache key	$this
get_key()	Gets the cache key	(string) Cache key
set_expiration( (int) $expiration )	Sets the cache expiration in seconds	$this
get_expiration()	Gets the cache expiration	(int) Expiration seconds Default 0 which means the cache doesn't expire
set( (mixed) $value )	Sets the cache	void
add( (mixed) $value )	Sets the cache only if it wasn't set before	void
get()	Gets the cached value	mixed|false False if not set
delete()	Deletes the cache	void

Cache manipulator

The Cache manipulator object allows you to use the collect method to easily get/store the cache value.

See the below example with Object Cache (you can pass the Transient Driver as well).

use Micropackage\Cache\Cache;
use Micropackage\Cache\Driver\ObjectCache;

$driver = new ObjectCache( $group = 'my_group', $expiration = DAY_IN_SECONDS );
$cache  = new Cache( $driver, $cache_key = 'extremaly_important_thing' );

$the_thing = $cache->collect( function() {
	return 'The value was not set apparently';
} );

The collect method takes a callable function as an argument. If the cache wasn't set for the key provided in cache construtor, the callable is called which should return the value for cache. The value is stored and returned.

Using variables from outside the callable:

$some_var = 'I am awesome!';

$the_thing = $cache->collect( function() use ( $some_var ) {
	return $some_var;
} );

📦 About the Micropackage project

Micropackages - as the name suggests - are micro packages with a tiny bit of reusable code, helpful particularly in WordPress development.

The aim is to have multiple packages which can be put together to create something bigger by defining only the structure.

Micropackages are maintained by BracketSpace.

📖 Changelog

See the changelog file.

📃 License

This software is released under MIT license. See the LICENSE file for more information.