apcu_dec
apcu_dec
(PECL apcu >= 4.0.0)
apcu_dec - 减少一个存储的数字
描述
int apcu_dec ( string $key [, int $step = 1 [, bool &$success ]] )
减少一个存储的整数值。
参数
key
价值的关键在减少。
step
该步骤或降低的值。
success
（可选）将成功或失败布尔值传递给此引用变量。
返回值
返回key成功或当FALSE失败时的值的当前值
例子
Example #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
?>
上面的例子会输出类似于：
Let's do something with success
42
41
31
21
bool(true)
Now, let's fail
bool(false)
bool(false)
