Retrieves information about data stored in the user cache

# wincache_ucache_info

(PECL wincache >= 1.1.0)

wincache_ucache_info — Retrieves information about data stored in the user cache

### 说明

function wincache_ucache_info(bool `$summaryonly` = `false`, string `$key` = NULL): array|false

Retrieves information about data stored in the user cache.

### 参数

`summaryonly`

  Controls whether the returned array will contain information about individual cache entries along with the user cache summary.

`key`

  The key of an entry in the user cache. If specified then the returned array will contain information only about that cache entry. If not specified and `summaryonly` is set to `false` then the returned array will contain information about all entries in the cache.

### 返回值

Array of meta data about user cache 或者在失败时返回 `false`

The array returned by this function contains the following elements:

- `total_cache_uptime` - total time in seconds that the user cache has been active
- `total_item_count` - total number of elements that are currently in the user cache
- `is_local_cache` - true is the cache metadata is for a local cache instance, false if the metadata is for the global cache
- `total_hit_count` - number of times the data has been served from the cache
- `total_miss_count` - number of times the data has not been found in the cache

- `ucache_entries` - an array that contains the information about all the cached items:

  - `key_name` - name of the key which is used to store the data
  - `value_type` - type of value stored by the key
  - `use_time` - time in seconds since the file has been accessed in the opcode cache
  - `last_check` - time in seconds since the file has been checked for modifications
  - `is_session` - indicates if the data is a session variable
  - `ttl_seconds` - time remaining for the data to live in the cache, 0 meaning infinite
  - `age_seconds` - time elapsed from the time data has been added in the cache
  - `hitcount` - number of times data has been served from the cache

### 示例

示例 #1 Using wincache_ucache_info()

    <?php
    wincache_ucache_get('green');
    wincache_ucache_set('green', 2922);
    wincache_ucache_get('green');
    wincache_ucache_get('green');
    wincache_ucache_get('green');
    print_r(wincache_ucache_info());
    ?>

以上示例会输出：

    Array
    ( ["total_cache_uptime"] => int(0)
      ["is_local_cache"] => bool(false)
      ["total_item_count"] => int(1)
      ["total_hit_count"] => int(3)
      ["total_miss_count"] => int(1)
      ["ucache_entries"] => Array(1)
        ( [1] => Array(6)
          (
            ["key_name"] => string(5) "green"
            ["value_type"] => string(4) "long"
            ["is_session"] => int(0)
            ["ttl_seconds"] => int(0)
            ["age_seconds"] => int(0)
            ["hitcount"] => int(3)
           )
        )
    )

### 参见

- wincache_fcache_meminfo() - Retrieves information about file cache memory usage
- wincache_ocache_fileinfo() - Retrieves information about files cached in the opcode cache
- wincache_ocache_meminfo() - Retrieves information about opcode cache memory usage
- wincache_rplist_meminfo() - Retrieves information about memory usage by the resolve file path cache
- wincache_rplist_fileinfo() - Retrieves information about resolve file path cache
- wincache_refresh_if_changed() - Refreshes the cache entries for the cached files
- wincache_ucache_meminfo() - Retrieves information about user cache memory usage
- wincache_scache_info() - Retrieves information about files cached in the session cache
- wincache_scache_meminfo() - Retrieves information about session cache memory usage

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