apcu_dec
(PECL apcu >= 4.0.0)
apcu_dec — Decrease a stored number
說明
apcu_dec(
string
int
bool
int
): int|false
string
$key,int
$step = 1,bool
&$success = ?,int
$ttl = 0): int|false
Decreases a stored integer value.
參數
-
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,
或者在失敗時返回 false
範例
示例 #1 apcu_dec() example
<?php
echo "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);
?>
以上例程的輸出類似於：
Let's do something with success 42 41 31 21 bool(true) Now, let's fail bool(false) bool(false)
參見
- apcu_inc() - Increase a stored number