The 'php memcached getallkeys not working' error can be caused by various reasons, including but not limited to:
Wrong or outdated version of Memcached: Older versions of Memcached may not support the 'getallkeys' command, which could lead to the error.
Incorrect Memcached configuration: If the Memcached server is not configured correctly or has insufficient memory, it may not be able to retrieve all the keys, leading to the error.
Bugs in the PHP extension: A bug or compatibility issue with the PHP extension that communicates with Memcached could cause the 'getallkeys' command to fail.
To resolve the 'php memcached getallkeys not working' error, you can try the following solutions:
Upgrade to the latest version of Memcached: If you're using an older version of Memcached, try upgrading to the latest stable release to ensure compatibility with the 'getallkeys' command.
Check your Memcached configuration: Ensure that the Memcached server is properly configured with enough memory allocated to store all the keys. You can increase the amount of memory available to Memcached or reduce the number of items being stored if the server is running out of memory.
Update the PHP Memcached extension: Make sure that you have the latest version of the PHP extension installed, as this may contain bug fixes or updates that address the issues causing the error.
Use alternative solutions: If none of the above solutions work, you can try using alternative methods to retrieve all the keys, such as iterating through all the keys or maintaining a separate key index. However, these alternatives may not be as efficient as the 'getallkeys' command.