apcu_delete - PHP code example

A PHP Function That Removes a Stored Value From Cache

A PHP function that removes a stored value from cache, given the key used to store it (with apcu_store()). Returns TRUE on success, FALSE on failure.

Caching can drastically reduce the amount of work that the server has to do for each request, especially if the page that is requested is frequently accessed by the same users. This is because the output of the same calculation will often be identical for many different users, so the server only has to do the calculations once and then can deliver that result to all users without having to wait for the results of the calculation on every single user’s computer.

OPcache improves PHP performance by caching precompiled script bytecode in shared memory, which eliminates the need for PHP to parse the script on each request and thus significantly speeds up the execution of your scripts. APCu, on the other hand, does not include opcode caching and can only be used to cache object data, but it is still a useful tool for speeding up your website.

The Resolve File Path Cache is a useful feature of APCu, as PHP scripts typically access files using relative paths, which need to be normalized into an absolute path by the PHP engine. This can cause a lot of overhead, and the APCu extension stores this mapping in the Resolve File Path Cache so that the PHP engine does not have to do it on each request.

apcu_delete example

return $result;
    }

    /** * Remove a cache record * * @param string $id cache id * @return boolean true if no problem */
    public function remove($id)
    {
        return apcu_delete($id);
    }

    /** * Clean some cache records * * Available modes are : * 'all' (default) => remove all cache entries ($tags is not used) * 'old' => unsupported * 'matchingTag' => unsupported * 'notMatchingTag' => unsupported * 'matchingAnyTag' => unsupported * * @param string $mode clean mode * @param array $tags array of tags * @throws Zend_Cache_Exception * @return boolean true if no problem */

/** * {@inheritdoc} */
  public function store($cid, $data) {
    apcu_store($cid, $data);
  }

  /** * {@inheritdoc} */
  public function delete($cid) {
    apcu_delete($cid);
  }

}

    }

    protected function doHave(string $id): bool
    {
        return apcu_exists($id);
    }

    protected function doClear(string $namespace): bool
    {
        return isset($namespace[0]) && class_exists(\APCUIterator::class, false) && ('cli' !== \PHP_SAPI || filter_var(\ini_get('apc.enable_cli'), \FILTER_VALIDATE_BOOL))
            ? apcu_delete(new \APCUIterator(sprintf('/^%s/', preg_quote($namespace, '/')), \APC_ITER_KEY))
            : apcu_clear_cache();
    }

    protected function doDelete(array $ids): bool
    {
        foreach ($ids as $id) {
            apcu_delete($id);
        }

        return true;
    }

  public function setMultiple(array $items = []) {
    foreach ($items as $cid => $item) {
      $this->set($cid, $item['data'], $item['expire'] ?? CacheBackendInterface::CACHE_PERMANENT, $item['tags'] ?? []);
    }
  }

  /** * {@inheritdoc} */
  public function delete($cid) {
    apcu_delete($this->getApcuKey($cid));
  }

  /** * {@inheritdoc} */
  public function deleteMultiple(array $cids) {
    apcu_delete(array_map([$this, 'getApcuKey'], $cids));
  }

  /** * {@inheritdoc} */