Php/docs/function.apcu-dec
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apcu_dec
(PECL apcu >= 4.0.0)
apcu_dec — Decrease a stored number
说明
apcu_dec
( string $key
[, int $step = 1
[, bool &$success
[, int $ttl = 0
]]] ) : int|false
Decreases a stored integer value.
参数
key- The key of the value being decreased.
step- The step, or value to decrease.
success- Optionally pass the success or fail boolean value to this referenced variable.
ttl- TTL to use if the operation inserts a new value (rather than decrementing an existing one).
返回值
Returns the current value of key's value on success,
或者在失败时返回 false
更新日志
| 版本 | 说明 |
|---|---|
| 5.1.12 | The ttl parameter has been added.
|
范例
Example #1 apcu_dec() example
<?phpecho "Let's do something with success", PHP_EOL;apcu_store('anumber', 42);echo apcu_fetch('anumber'), PHP_EOL;echo apcu_dec('anumber'), PHP_EOL;echo apcu_dec('anumber', 10), PHP_EOL;echo apcu_dec('anumber', 10, $success), PHP_EOL;var_dump($success);echo "Now, let's fail", PHP_EOL, PHP_EOL;apcu_store('astring', 'foo');$ret = apcu_dec('astring', 1, $fail);var_dump($ret);var_dump($fail);?>
以上例程的输出类似于：
Let's do something with success 42 41 31 21 bool(true) Now, let's fail bool(false) bool(false)
