February 12, 2011 
Definition:
function wp_cache_add($key, $data, $group = '', $expire = 0) {}
Adds data to the cache, if the cache key doesn’t already exist.
Parameters
- int|string $key: The cache key to use for retrieval later
- mixed $data: The data to add to the cache store
- string $group: The group to add the cache to
- int $expire: When the cache data should be expired
Source code
function wp_cache_add($key, $data, $group = '', $expire = 0) {
global $wp_object_cache;
return $wp_object_cache->add($key, $data, $group, $expire);
}
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A HitchHackers guide through WordPress 
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