What is `wp_cache_add()` vs `wp_cache_set()` in the WordPress Object Cache API?

Question

WordPress Expert — Medium

What is `wp_cache_add()` vs `wp_cache_set()` in the WordPress Object Cache API?

Accepted Answer

wp_cache_add() only stores the value if the key does not already exist, returning false if it does; wp_cache_set() always overwrites any existing value for the key. This distinction is crucial for developers managing cached data efficiently.