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 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