wincache_ucache_exists

(PECL wincache >= 1.1.0)

wincache_ucache_exists — Checks if a variable exists in the user cache

wincache_ucache_exists(string $key): bool

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

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

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

示例 #1 Using wincache_ucache_exists()

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

以上示例会输出：

bool(true)

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