The Memcached.cas function in PHP, also known as "Compare and Swap," is used to perform a compare-and-swap operation on a specified key-value pair in the Memcached server. This operation allows for atomic updates to the value associated with a key, based on its current state.
The cas function takes parameters such as the Memcached object, the key for the item to be updated, the original value for comparison, and the new value to be set if the comparison is successful. If the original value in the server matches the one provided, the new value will be stored. If the comparison fails, indicating that the value has been modified by another process, the update will be aborted.
The cas function is often used in scenarios where concurrent access to a shared data item is expected, ensuring that only one process can successfully modify the value at a time. This helps prevent race conditions and ensures data consistency.
PHP Memcached::cas - 16 examples found. These are the top rated real world PHP examples of Memcached::cas extracted from open source projects. You can rate examples to help us improve the quality of examples.