(PECL wincache >= 1.1.0)
wincache_ucache_exists — Checks if a variable exists in the user cache
$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)