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
keythat was used to store the variable in the cache.keyis case sensitive.
返回值
Returns TRUE if variable with the key exitsts,
otherwise returns FALSE.
范例
Example #1 Using wincache_ucache_exists()
<?php
if (!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