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

范例

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)

参见