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See Release Notes

  • Bug fixes for general core bugs in 3.11.x will end 14 Nov 2022 (12 months plus 6 months extension).
  • Bug fixes for security issues in 3.11.x will end 13 Nov 2023 (18 months plus 12 months extension).
  • PHP version: minimum PHP 7.3.0 Note: minimum PHP version has increased since Moodle 3.10. PHP 7.4.x is supported too.
<?php

namespace Psr\SimpleCache;

interface CacheInterface
{
    /**
     * Fetches a value from the cache.
     *
     * @param string $key     The unique key of this item in the cache.
     * @param mixed  $default Default value to return if the key does not exist.
     *
     * @return mixed The value of the item from the cache, or $default in case of cache miss.
     *
     * @throws \Psr\SimpleCache\InvalidArgumentException
     *   MUST be thrown if the $key string is not a legal value.
     */
< public function get($key, $default = null);
> public function get(string $key, mixed $default = null): mixed;
/** * Persists data in the cache, uniquely referenced by a key with an optional expiration TTL time. * * @param string $key The key of the item to store. * @param mixed $value The value of the item to store, must be serializable. * @param null|int|\DateInterval $ttl Optional. The TTL value of this item. If no value is sent and * the driver supports TTL then the library may set a default value * for it or let the driver take care of that. * * @return bool True on success and false on failure. * * @throws \Psr\SimpleCache\InvalidArgumentException * MUST be thrown if the $key string is not a legal value. */
< public function set($key, $value, $ttl = null);
> public function set(string $key, mixed $value, null|int|\DateInterval $ttl = null): bool;
/** * Delete an item from the cache by its unique key. * * @param string $key The unique cache key of the item to delete. * * @return bool True if the item was successfully removed. False if there was an error. * * @throws \Psr\SimpleCache\InvalidArgumentException * MUST be thrown if the $key string is not a legal value. */
< public function delete($key);
> public function delete(string $key): bool;
/** * Wipes clean the entire cache's keys. * * @return bool True on success and false on failure. */
< public function clear();
> public function clear(): bool;
/** * Obtains multiple cache items by their unique keys. *
< * @param iterable $keys A list of keys that can obtained in a single operation.
> * @param iterable<string> $keys A list of keys that can be obtained in a single operation.
* @param mixed $default Default value to return for keys that do not exist. *
< * @return iterable A list of key => value pairs. Cache keys that do not exist or are stale will have $default as value.
> * @return iterable<string, mixed> A list of key => value pairs. Cache keys that do not exist or are stale will have $default as value.
* * @throws \Psr\SimpleCache\InvalidArgumentException * MUST be thrown if $keys is neither an array nor a Traversable, * or if any of the $keys are not a legal value. */
< public function getMultiple($keys, $default = null);
> public function getMultiple(iterable $keys, mixed $default = null): iterable;
/** * Persists a set of key => value pairs in the cache, with an optional TTL. * * @param iterable $values A list of key => value pairs for a multiple-set operation. * @param null|int|\DateInterval $ttl Optional. The TTL value of this item. If no value is sent and * the driver supports TTL then the library may set a default value * for it or let the driver take care of that. * * @return bool True on success and false on failure. * * @throws \Psr\SimpleCache\InvalidArgumentException * MUST be thrown if $values is neither an array nor a Traversable, * or if any of the $values are not a legal value. */
< public function setMultiple($values, $ttl = null);
> public function setMultiple(iterable $values, null|int|\DateInterval $ttl = null): bool;
/** * Deletes multiple cache items in a single operation. *
< * @param iterable $keys A list of string-based keys to be deleted.
> * @param iterable<string> $keys A list of string-based keys to be deleted.
* * @return bool True if the items were successfully removed. False if there was an error. * * @throws \Psr\SimpleCache\InvalidArgumentException * MUST be thrown if $keys is neither an array nor a Traversable, * or if any of the $keys are not a legal value. */
< public function deleteMultiple($keys);
> public function deleteMultiple(iterable $keys): bool;
/** * Determines whether an item is present in the cache. * * NOTE: It is recommended that has() is only to be used for cache warming type purposes * and not to be used within your live applications operations for get/set, as this method * is subject to a race condition where your has() will return true and immediately after, * another script can remove it making the state of your app out of date. * * @param string $key The cache item key. * * @return bool * * @throws \Psr\SimpleCache\InvalidArgumentException * MUST be thrown if the $key string is not a legal value. */
< public function has($key);
> public function has(string $key): bool;
}