Use the WordPress transient API as a PSR-16 cache

composer require lachlanarthur/psr16-wordpress-transients

use LachlanArthur\Psr16WordPressTransients\WordPressTransientAdapter

new WordPressTransientAdapter( 'prefix-', MONTH_IN_SECONDS );

NOTES

• This cache cannot store null or false. This is because the WP transient API returns false for a cache miss, and the PSR-16 spec must return null for a cache miss.

• Key length is restricted to 172 characters, including the prefix.