Memcached::replace() function in PHP is used to replace the value of an existing item. It's frequently used when you need to update data that is stored in a Memcached server, but only if that key already exists. It's different from
set() as it won't create a new key-value pair if the key doesn't exist.
Below is a simple example of how to use
Memcached::replace(). This example assumes that a key "TestKey" already exists in the Memcached server.
In this code, we first create an instance of the Memcached class and add a server. We then try to replace the value associated with "TestKey". If the operation is successful, we output a success message, otherwise we output a failure message.
replace(). Use the
get()method to check if a key exists and handle it accordingly.
replace()without ensuring the key already exists: Unlike
replace()won't create a new key-value pair if the key doesn't exist.
replace()(like when a key is not found).
Memcached::replace()only updates the value if the key already exists, whereas
Memcached::set()will set the value whether the key exists or not.
Memcached::replace()to change the expiration time of an existing item?
Memcached::replace()method accepts an optional expiration time argument. If provided, this will update the expiration time of the item.