# apcu_inc

(PECL apcu >= 4.0.0)

apcu_inc — Increase a stored number

### 说明

apcu_inc ( string `$key` [, int `$step` = 1 [, bool `&$success` ]] ) : int

Increases a stored number.

### 参数

`key`

  The key of the value being increased.

`step`

  The step, or value to increase.

`success`

  Optionally pass the success or fail boolean value to this referenced variable.

### 返回值

Returns the current value of `key`'s value on success, 或者在失败时返回 `FALSE`

### 范例

Example #1 apcu_inc() example

    <?php
    echo "Let's do something with success", PHP_EOL;

    apcu_store('anumber', 42);

    echo apcu_fetch('anumber'), PHP_EOL;

    echo apcu_inc('anumber'), PHP_EOL;
    echo apcu_inc('anumber', 10), PHP_EOL;
    echo apcu_inc('anumber', 10, $success), PHP_EOL;

    var_dump($success);

    echo "Now, let's fail", PHP_EOL, PHP_EOL;

    apcu_store('astring', 'foo');

    $ret = apcu_inc('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
    43
    53
    63
    bool(true)
    Now, let's fail

    bool(false)
    bool(false)

### 参见

- apcu_dec() - Decrease a stored number