Php/docs/function.wincache-ucache-exists

• PHP Manual
• WinCache 函数
• Checks if a variable exists in the user cache

wincache_ucache_exists

(PECL wincache >= 1.1.0)

wincache_ucache_exists — Checks if a variable exists in the user cache

说明

wincache_ucache_exists ( string $key ) : bool

Checks if a variable with the key exists in the user cache or not.

参数

key

The key that was used to store the variable in the cache. key is case sensitive.

返回值

Returns true if variable with the key exitsts, otherwise returns false.

范例

Example #1 Using wincache_ucache_exists()

<?phpif (!wincache_ucache_exists('green'))    wincache_ucache_set('green', 1);var_dump(wincache_ucache_exists('green'));?>

以上例程会输出：

bool(true)

参见

• wincache_ucache_set() - Adds a variable in user cache and overwrites a variable if it already exists in the cache
• wincache_ucache_add() - Adds a variable in user cache only if variable does not already exist in the cache
• wincache_ucache_get() - Gets a variable stored in the user cache
• wincache_ucache_clear() - Deletes entire content of the user cache
• wincache_ucache_delete() - Deletes variables from the user cache
• wincache_ucache_meminfo() - Retrieves information about user cache memory usage
• wincache_ucache_info() - Retrieves information about data stored in the user cache