Wondering how to use WordPress wp_cache_get? We can help you.

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How to use WordPress wp_cache_get?

Basically, the below function Retrieves the cache contents from the cache by key and group.

wp_cache_get( int|string $key, string $group = ”, bool $force = false, bool $found = null )

Parameters :

$key : (int|string) The key under which the cache contents are stored.

$group : (string) Where the cache contents are grouped.

Default value: ”

$force : (bool) Whether to force an update of the local cache from the persistent cache.

Default value: false

$found : (bool) Whether the key was found in the cache (passed by reference). Disambiguates a return of false, a storable value.

Default value: null

Return

(mixed|false) The cache contents on success, false on failure to retrieve contents.

Source

File: wp-includes/cache.php

function wp_cache_get( $key, $group= '', $force= false, &$found= null ){

global$wp_object_cache;    

return$wp_object_cache->get( $key, $group, $force, $found);

}

Examples

1. Firstly, retrieve the data from the cache

By default, most of the data is store in the cache.

For example, WordPress options are added to the cache when retrieve for the first time, and all the following times, this option will retrieve from the cache, not from DB.

This is made to minimize the number of database requests.

This is how we can retrieve the user’s metadata from the cache:

$user_meta = wp_cache_get( 1, 'user_meta' );

2. Secondly, save data to the cache and retrieve it when we need it

In case, we have made a heavy database query and its result is need in the different parts of the page.

Then, we can save it to the cache and access every time we need it.

Thus, we eliminate the need to do the same database query many times for a single page:

$cache_key = 'my_db_result';

// Do a database query and save it to the cache if the there is no cache data with this key:
$my_db_result = wp_cache_get( $cache_key );
if( false === $my_db_result ){
	global $wpdb;
	$my_db_result = $wpdb->get_results("SELECT * FROM $wpdb->posts WHERE post_type = 'books'");

	wp_cache_set( $cache_key, $my_db_result );
}

// $my_db_result has the same content as the cache

print_r( $my_db_result );

Such cache saving makes sense only if your site has an object caching plugin install.

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Conclusion

To sum up, our skilled Support Engineers at Bobcares demonstrated how to use WordPress wp_cache_get.