PHP Manual
WinCache 函数
Compares the variable with old value and assigns new value to it

wincache_ucache_cas

(PECL wincache >= 1.1.0)

wincache_ucache_cas — Compares the variable with old value and assigns new value to it

说明

wincache_ucache_cas ( string $key , int $old_value , int $new_value ) : bool

Compares the variable associated with the key with old_value and if it matches then assigns the new_value to it.

参数

key: The key that is used to store the variable in the cache. key is case sensitive.
old_value: Old value of the variable pointed by key in the user cache. The value should be of type long, otherwise the function returns FALSE.
new_value: New value which will get assigned to variable pointer by key if a match is found. The value should be of type long, otherwise the function returns FALSE.

返回值

成功时返回 TRUE，或者在失败时返回 FALSE。

范例

Example #1 Using wincache_ucache_cas()

 <?php
wincache_ucache_set('counter', 2922);
var_dump(wincache_ucache_cas('counter', 2922, 1));
var_dump(wincache_ucache_get('counter'));
?>

以上例程会输出：

bool(true) 
int(1)

参见

wincache_ucache_inc() - Increments the value associated with the key
wincache_ucache_dec() - Decrements the value associated with the key

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