wincache_ucache_exists()
(PECL wincache >= 1.1.0)
Checks if a variable exists in the user cache
说明
wincache_ucache_exists(string $key): bool
Checks if a variable with the$keyexists in the user cache or not.
参数
- $key
The$keythat was used to store the variable in the cache.$keyis case sensitive.
返回值
Returns TRUE
if variable with the$keyexitsts, 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 cachewincache_ucache_add()
Adds a variable in user cache only if variable does not already exist in the cachewincache_ucache_get()
Gets a variable stored in the user cachewincache_ucache_clear()
Deletes entire content of the user cachewincache_ucache_delete()
Deletes variables from the user cachewincache_ucache_meminfo()
Retrieves information about user cache memory usagewincache_ucache_info()
Retrieves information about data stored in the user cache