wp_cache_set( int|string $key, mixed $data, string $group = '', int $expire ): bool

User Contributed Notes

1. Skip to note 3 content

   Mayeenul Islam 7 years ago

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   function prefix_get_post_count( $post_status = 'publish' ) {
       $cache_key = 'prefix_post_count_'. $post_status;
       $_posts = wp_cache_get( $cache_key );
       if ( false === $_posts ) {
           $_posts = $wpdb->get_var(
                       $wpdb->prepare(
                           "SELECT COUNT(*) FROM $wpdb->posts WHERE post_type = 'post' AND post_status = %s",
                           $post_status
                       ));
    
           wp_cache_set( $cache_key, $_posts );
       }
    
       return $_posts;
   }
2. Skip to note 4 content

   Mahdi Yazdani 3 years ago

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   Requests made to third-party endpoints should be cached, regardless of being synchronous or asynchronous. Not doing so will result in your site’s load time depending on an unreliable API response!

   /**
    * Retrieve posts from another blog and cache the response body.
    *
    * @return   string   Body of the response. Empty string if no body or incorrect parameter given.
    */
   function wpdocs_get_posts_from_other_blog() {
       $posts = wp_cache_get( 'wpdocs_other_blog_posts' );
       
       if ( false === $posts ) {
           $request = wp_remote_get( 'https://jsonplaceholder.typicode.com/posts' );
           $posts = wp_remote_retrieve_body( $request );
   
           wp_cache_set( 'wpdocs_other_blog_posts', $posts, '', HOUR_IN_SECONDS );
       }
   
       return $posts;
   }

   • Keep in mind this uses the object cache, so if your server doesn’t have an object cache, better to use the transient functions. Transients are stored in object cache anyway, so transients provide wider compatibility.

     crstauf 3 years ago