Memcached::add() method in PHP is commonly used when you need to store a new item in memcached if it does not already exist. This can be useful when you're managing cached content and want to avoid overwriting existing keys.
Here's an example of how to use the
In this example, we first create a new instance of the Memcached client and connect to the server running on localhost. Then we define a key-value pair that we want to add to the cache. The
add() method attempts to add this item to the cache, and we check its return value to see if the operation was successful.
add()function. It gives important information about whether the operation was successful.
add()will not overwrite existing items. If you need to ensure that the item is stored regardless of whether it already exists, consider using the
add()returns false, it doesn't always mean there was a problem with the server or the operation. It could also mean that an item with the same key already exists.
add()will not overwrite existing values, which can lead to confusion if you're expecting it to update values.
Q: What is the difference between
set() in Memcached?
add() method will only add an item if it does not already exist in the cache. On the other hand,
set() will store the item regardless of whether it already exists, overwriting any existing item with the same key.
Q: What happens if I try to add an item with a key that already exists?
A: If you use the
add() function and the key already exists, the function will return false, and the existing item in the cache will not be overwritten.