Php/docs/function.wincache-ucache-cas
来自菜鸟教程
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 typelong
, otherwise the function returnsfalse
. new_value
- New value which will get assigned to variable pointer by
key
if a match is found. The value should be of typelong
, otherwise the function returnsfalse
.
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()
<?phpwincache_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