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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

    示例

    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);
    ?>

    以上示例的输出类似于：

    Let's do something with success
42
41
31
21
bool(true)
Now, let's fail

bool(false)
bool(false)

    参见

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